Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Balance at beginning of period at Dec. 31, 2018	$ 1,063,198	$ 119	$ 1,079,188	$ (16,109)	$ 0
Balance at beginning of period (in shares) at Dec. 31, 2018		119,078
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	109,798				109,798
Other comprehensive income (loss)	(1,897)			(1,897)
Dividends declared	(36,998)				(36,998)
Net issuances of restricted stock	0
Net issuances of restricted stock (in shares)		281
Stock-based compensation expense	11,244		11,244
Repurchases of common stock	(68,316)	$ (1)			(68,315)
Repurchases of common stock (in shares)		(1,038)
Balance at end of period at Mar. 31, 2019	1,077,029	$ 118	1,090,432	(18,006)	4,485
Balance at end of period (in shares) at Mar. 31, 2019		118,321
Balance at beginning of period at Dec. 31, 2019	1,143,683	$ 115	1,127,487	(19,986)	36,067
Balance at beginning of period (in shares) at Dec. 31, 2019		115,120
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	89,915				89,915
Other comprehensive income (loss)	(13,700)			(13,700)
Dividends declared	(39,441)				(39,441)
Net issuances of restricted stock	0	$ 1	(1)
Net issuances of restricted stock (in shares)		745
Stock-based compensation expense	13,525		13,525
Repurchases of common stock	(63,499)	$ (1)			(63,498)
Repurchases of common stock (in shares)		(1,263)
Balance at end of period at Mar. 31, 2020	$ 1,129,925	$ 115	$ 1,141,011	$ (33,686)	$ 22,485
Balance at end of period (in shares) at Mar. 31, 2020		114,602