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Stock Options, Restricted Stock and Restricted Stock Units (Details 4) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of information regarding share-based payment arrangements      
Proceeds from stock options exercised
Tax shortfall related to share-based payment arrangements $ (24) $ (2,039) $ (3,567)
Intrinsic value of stock options exercised