Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended									12 Months Ended
	Jan. 07, 2016	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017		Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Repurchase of treasury stock (in shares)											1,066,409	594,974
Shares withheld for tax withholding obligations for the vesting of restricted stock awards (in shares)											132,021	305,828
Remaining number of shares authorized to be repurchased (in shares)		1,611,155									1,611,155
MaxAmountOfTenderOfferForRepurchaseOfShares	$ 125,000
Share Price	$ 23.75
Stock Repurchased and Retired During Period, Shares	6,027,062
Repurchase of common stock	$ 143,100												$ 144,263
Transaction Costs Related to Tender Offer	$ 1,100
Borrowings under long-term debt agreement													104,400
Payments of Dividends [Abstract]
Dividends declared per share of common stock (in dollars per share)		$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 1.150	[1]	$ 0.150	$ 0.150	$ 0.125
Dividends paid											$ 33,408	$ 65,768	$ 20,599
Class of Stock [Line Items]
Special dividend, per share						$ 1.00
Special dividend												$ 41,700		$ 50,700
Preferred stock, authorized (in shares)		20,000,000				20,000,000					20,000,000	20,000,000
Preferred Stock, Value, Issued		$ 0				$ 0					$ 0	$ 0

[1] (1) Includes a $1.00 per share special dividend.