Share-based Compensation (Details 3) - SARs activity [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summary of SARs activity under the 2005 Plan
Stock Appreciation Rights (SARs), Outstanding, Beginning Balance (in shares)	139,111	207,234	597,392
Stock Appreciation Rights (SARs), Granted (in shares)	134,037	119,342	0
Stock Appreciation Rights (SARs), Cancelled/Forfeited (in shares)	(29,817)	(50,550)	(41,114)
Stock Appreciation Rights (SARs), Exercised (in shares)	(39,288)	(136,915)	(349,044)
Stock Appreciation Rights (SARs), Outstanding, Ending Balance (in shares)	204,043	139,111	207,234
SARs Weighted Average Exercise Price
Weighted Average Exercise Price, Outstanding, Beginning of the year (in dollars per share)	$ 41.02	$ 25.85	$ 21.54
Weighted Average Exercise Price, Granted (in dollars per share)	50.27	49.31	0.00
Weighted Average Exercise Price, Outstanding, End of the year (in dollars per share)	$ 47.93	$ 41.02	$ 25.85
Stock Appreciation Rights (SARs), Exercisable (in shares)	48,761
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 40.68
Weighted Average Remaining Contractual Life, Outstanding	63 months
Weighted Average Remaining Contractual Life, Exercisable	40 months
Weighted Average Grant Fair Value of SARs, Outstanding (in dollars per share)	$ 11.38
Weighted Average Fair Value of SARs, Exercisable (in dollars per share)	$ 12.69
Aggregate Intrinsic Value, Outstanding	$ 382
Aggregate Intrinsic Value. Exercisable	$ 382