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Commitments and Contingencies (Narrative) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Increase (decrease) in contractual obligations not reflected in the balance sheet $ 57,166
Contractual Obligation 1,374,763
Loss Contingency, Damages Sought, Value $ 280,000