Quarterly report pursuant to Section 13 or 15(d)

Changes in Shareholders' Equity (Details)

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Changes in Shareholders' Equity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Mar. 31, 2018
Dividends declared per share $ 0.05 $ 0.00 $ 0.10 $ 0.00        
Net income (loss) $ 16,602 $ 40,806 $ 41,682 $ 113,167        
Other Comprehensive Income (Loss), Net of Tax 19,088 (9,483) 5,739 (35,893)        
Payments of Ordinary Dividends, Common Stock 0 (2,873) (5,803) (2,873)        
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures (1,681) (4,122) (2,978) (9,854)        
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 2,387 1,534 9,258 10,011        
Stockholders' Equity Attributable to Parent $ 687,313 $ 538,433 $ 687,313 $ 538,433 $ 650,917 $ 639,415 $ 512,571 $ 463,875
Common Stock [Member]                
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures 200 383 445 1,178        
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures $ 2 $ 4 $ 5 $ 12        
Shares, Issued 58,267 57,819 58,267 57,819 58,067 57,822 57,436 56,641
Stockholders' Equity Attributable to Parent $ 583 $ 578 $ 583 $ 578 $ 581 $ 578 $ 574 $ 566
Retained Earnings [Member]                
Net income (loss) 16,602 40,806 41,682 113,167        
Payments of Ordinary Dividends, Common Stock 0 2,873            
Stockholders' Equity Attributable to Parent 240,074 113,664 240,074 113,664 223,472 204,195 75,731 3,370
AOCI Including Portion Attributable to Noncontrolling Interest [Member]                
Other Comprehensive Income (Loss), Net of Tax 19,088 (9,483) 5,739 (35,893)        
Additional Paid-in Capital [Member]                
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures (1,683) (4,126) (2,983) (9,866)        
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 2,387 1,534 9,258 10,011        
Stockholders' Equity Attributable to Parent 471,641 462,882 471,641 462,882 470,937 465,366 465,474 462,737
AOCI Attributable to Parent [Member]                
Stockholders' Equity Attributable to Parent $ (24,985) $ (38,691) $ (24,985) $ (38,691) $ (44,073) $ (30,724) $ (29,208) $ (2,798)