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Commitments and Contingencies (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]      
Rent Expense $ 23,011us-gaap_LeaseAndRentalExpense $ 21,519us-gaap_LeaseAndRentalExpense $ 21,614us-gaap_LeaseAndRentalExpense