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Summary of Significant Accounting Policies (Assets, Liabilities and Net Assets of Company's Venezuelan Subsidiaries) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Significant Accounting Policies [Line Items]          
Net revenues $ 154,314 $ 131,849 $ 302,417 $ 247,231  
Assets 1,020,635   1,020,635   $ 966,848
Liabilities (676,192)   (676,192)   (611,060)
Venezuelan Operations [Member]          
Significant Accounting Policies [Line Items]          
Net revenues     19,669 $ 35,908  
Assets 46,482   46,482   75,153
Liabilities (43,701)   (43,701)   (43,359)
Net Assets $ 2,781   $ 2,781   $ 31,794