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Business and Basis of Presentation (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Numerator
Net income	$ 37,046	$ 38,058	$ 33,252	$ 33,925	$ (139,274)	$ 38,167	$ 30,841	$ 34,466	$ 142,281	$ (35,800)	$ 339,570
Denominator
Denominator for basic (loss) earnings per share - weighted average shares (in shares)	50,367	50,378	50,455	51,697	51,912	51,881	51,841	52,640	50,723	52,068	53,099
Dilutive effect of unvested restricted common stock and options issued to employees and directors (in shares)									417	0	427
Denominator for diluted (loss) earnings per share (in shares)	50,878	50,831	50,811	52,047	51,912	52,202	52,153	52,942	51,140	52,068	53,526
Earnings (loss) per Common Share:
Basic net (loss) earnings per share (in USD per share)	$ 0.74	$ 0.76	$ 0.66	$ 0.66	$ (2.68)	$ 0.74	$ 0.59	$ 0.65	$ 2.81	$ (0.69)	$ 6.40
Diluted net (loss) earnings per share (in USD per share)	$ 0.73	$ 0.75	$ 0.65	$ 0.65	$ (2.68)	$ 0.73	$ 0.59	$ 0.65	$ 2.78	$ (0.69)	$ 6.34
Antidilutive securities excluded from computation of earnings per share (in shares)									300	1,400	400

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