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Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 86,700	$ 63,107	$ 152,414	$ 115,176
Income attributable to unvested participating securities, basic EPS	(483)	(430)	(917)	(859)
Net income used in calculating basic EPS	$ 86,217	$ 62,677	$ 151,497	$ 114,317
Weighted-average vested shares	44,066	45,984	44,401	46,142
Basic EPS	$ 1.96	$ 1.36	$ 3.41	$ 2.48
Income attributable to unvested participating securities, diluted EPS	$ (482)	$ (430)	$ (915)	$ (857)
Net income used in calculating diluted EPS	$ 86,218	$ 62,677	$ 151,499	$ 114,319
Dilutive effect of incremental shares to be issued for contingently-issuable shares	141	87	128	80
Weighted-average shares used in calculating diluted EPS	44,207	46,071	44,529	46,222
Diluted EPS	$ 1.95	$ 1.36	$ 3.40	$ 2.47

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