Consolidated Statements of Equity (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Total Stockholders’ Equity	Noncontrolling Interests
Beginning Balance at Dec. 31, 2018	$ 2,056,937	$ 1,417	$ 658,720	$ 1,396,787	$ 2,056,924	$ 13
Beginning Balance (shares) at Dec. 31, 2018		141,661,713
Increase (Decrease) in Stockholders' Equity
Net income	26,333			26,333	26,333
Shares issued under share-based awards	199	$ 6	193		199
Shares issued under share-based awards (shares)		596,950
Minimum tax withholding paid on behalf of employees for restricted stock units	(3,612)		(3,612)		(3,612)
Stock-based compensation expense	6,786		6,786		6,786
Ending Balance at Jun. 30, 2019	2,086,643	$ 1,423	662,087	1,423,120	2,086,630	13
Ending Balance (shares) at Jun. 30, 2019		142,258,663
Beginning Balance at Mar. 31, 2019	2,057,036	$ 1,422	658,743	1,396,858	2,057,023	13
Beginning Balance (shares) at Mar. 31, 2019		142,210,147
Increase (Decrease) in Stockholders' Equity
Net income	26,262			26,262	26,262
Shares issued under share-based awards	1	$ 1	0		1
Shares issued under share-based awards (shares)		48,516
Minimum tax withholding paid on behalf of employees for restricted stock units	(7)		(7)		(7)
Stock-based compensation expense	3,351		3,351		3,351
Ending Balance at Jun. 30, 2019	2,086,643	$ 1,423	662,087	1,423,120	2,086,630	13
Ending Balance (shares) at Jun. 30, 2019		142,258,663
Beginning Balance at Dec. 31, 2019	$ 2,186,542	$ 1,361	581,195	1,603,974	2,186,530	12
Beginning Balance (shares) at Dec. 31, 2019	136,149,633	136,149,633
Increase (Decrease) in Stockholders' Equity
Net income	$ 88,411			88,411	88,411
Shares issued under share-based awards	921	$ 8	913		921
Shares issued under share-based awards (shares)		734,555
Minimum tax withholding paid on behalf of employees for restricted stock units	(5,473)		(5,473)		(5,473)
Stock-based compensation expense	7,411		7,411		7,411
Share repurchases	(102,001)	$ (66)	(101,935)		(102,001)
Share repurchases (Shares)		(6,558,323)
Ending Balance at Jun. 30, 2020	$ 2,175,811	$ 1,303	482,111	1,692,385	2,175,799	12
Ending Balance (shares) at Jun. 30, 2020	130,325,865	130,325,865
Beginning Balance at Mar. 31, 2020	$ 2,115,293	$ 1,302	478,122	1,635,857	2,115,281	12
Beginning Balance (shares) at Mar. 31, 2020		130,236,981
Increase (Decrease) in Stockholders' Equity
Net income	56,528			56,528	56,528
Shares issued under share-based awards	231	$ 1	230		231
Shares issued under share-based awards (shares)		88,884
Minimum tax withholding paid on behalf of employees for restricted stock units	(27)		(27)		(27)
Stock-based compensation expense	3,786		3,786		3,786
Share repurchases	0	$ 0	0		0
Share repurchases (Shares)		0
Ending Balance at Jun. 30, 2020	$ 2,175,811	$ 1,303	$ 482,111	$ 1,692,385	$ 2,175,799	$ 12
Ending Balance (shares) at Jun. 30, 2020	130,325,865	130,325,865