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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

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