Stockholders' Equity (Details)				12 Months Ended
	Feb. 11, 2020 $ / shares	Aug. 29, 2018 USD ($)	Aug. 01, 2018 $ / shares	Dec. 31, 2019 USD ($) vote $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)	Feb. 28, 2017 USD ($)	Oct. 31, 2015 USD ($)
Special Dividend
Cash dividend (in dollars per share)			$ 3.00
Payment of Special Dividend | $		$ 104,900,000		$ 0	$ 104,925,000	$ 0
Conversion ratio				1.055
Common Stock
Number of votes for each share | vote				1
Common stock, shares authorized (in shares) | shares				200,000,000	200,000,000
Common stock, par value (in dollars per share)				$ 0.01	$ 0.01
Preferred Stock
Preferred stock, authorized shares (in shares) | shares				5,000,000
Preferred stock, par value (in dollars per share)				$ 0.01
Treasury Stock
Number of shares acquired | shares				2,558,000	2,558,000
Common Stock
Treasury Stock
Authorized repurchase amount | $							$ 100,000,000	$ 100,000,000
Number of shares acquired | shares				2,558,000
Average per-share cost (in dollars per share)				$ 39.09
Share value remaining for repurchase | $				$ 100,000,000
Subsequent Event
Special Dividend
Cash dividend (in dollars per share)	$ 0.17