Stockholders' Equity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Jan. 16, 2015	Jul. 21, 2014
Equity, Class of Treasury Stock [Line Items]
Share repurchase program, amount authorized			$ 100,000	$ 100,000
Stock Repurchased and Retired During Period, Shares	43,000	3,400,000
Stock Repurchased and Retired During Period, Value	$ 3,819	$ 100,048
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 98,400
Stock Issued During Period, Shares, Acquisitions	794,700
Stock Repurchased During Period, Value	$ 1,600
Stock Issued During Period, Value, Acquisitions	$ 30,183
sharesreceivedforexercisepriceofoptions	46,174
payment exercise of stock option	$ 2,200
Additional Paid-in Capital [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Value	(1,173)	(31,194)
Stock Repurchased During Period, Value	400
Stock Issued During Period, Value, Acquisitions	30,175
Retained Earnings [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Value	(2,645)	$ (68,821)
Stock Repurchased During Period, Value	$ 1,200