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Commitments (Schedule of Rental Expenses and Sublease Income) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]        
Gross rental expense $ 1,493 $ 3,194 $ 3,771 $ 5,453
less: Sublease income (306) (895) (1,225) (1,730)
Net rental expense $ 1,187 $ 2,299 $ 2,546 $ 3,723