Common and Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Dec. 01, 2015	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Increase in share repurchase authorized amount	$ 300,000
Purchase of common stock (in shares)		1,273,961	266,000	738,593
Repurchase of common stock		$ 173,926	$ 29,074	$ 54,950
Remaining authorized repurchase amount		$ 377,000
Common stock, shares authorized (in shares)		150,000,000	150,000,000
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)		5,000,000	5,000,000
Preferred stock, par value (in dollars per share)		$ 0.01	$ 0.01
Preferred stock, shares issued (in shares)		0	0