Stockholders' Equity - Narrative (Details) - USD ($)		12 Months Ended
	Mar. 13, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 02, 2015	Oct. 27, 2011	Jul. 31, 2008
Class of Stock [Line Items]
Proceeds from issuance of common stock		$ 184,100,000
Stock repurchase program, authorized amount (in Dollars)					$ 30,000,000	$ 30,000,000
Repurchase of common stock		$ 5,000,000	$ 4,300,000	$ 7,700,000
Preferred stock par value (in Dollars per share)		$ 0.01	$ 0.01				$ 0.01
Series A Junior Participating Preferred Stock
Class of Stock [Line Items]
Common stock, purchase rights (in shares)							0.01
Preferred stock par value (in Dollars per share)							$ 0.01
Preferred stock, redemption price (in Dollars per share)							$ 72
Preferred stock, shares reserved for future issuance (in Shares)							1,500,000
Common Stock
Class of Stock [Line Items]
Stock awards issued (in Shares)	2,300,000.0	170,270
Proceeds from issuance of common stock	$ 184,100,000