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Equity (Details 4) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Proceeds from stock options exercised, excluding cashless exercise of $0.5 million, $0.6 million and $0.7 million in 2015, 2014 and 2013, respectively $ 653 $ 953 $ 1,668
Tax benefits 260 670 700
Intrinsic value of stock options exercised $ 1,137 $ 2,733 $ 4,088