Stock-Based Compensation (Other Stockholder Investment Information Textual) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Document Fiscal Year Focus	2015	2014	2013
Preferred Stock, Shares Outstanding	0	0
Repurchase of common stock	5,584,743	3,570,082
Aggregate price of repurchase stock	$ 134,630	$ 86,840
Percentage of Restrictions on Ownership of Company Common and Preferred Stock		3.90%
Long term incentive compensation [Member]
Class of Stock [Line Items]
Allocated Share-based Compensation Expense		$ (28)	$ (286)