Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Commitments and Contingencies (Narrative) (Details)

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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Rent expense   $ 14,000 $ 14,300 $ 10,700
Bank Loan [Member]        
Proceeds from secured loan $ 26,000