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Income Taxes - Foreign Tax Credit Carryforwards (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Deferred tax assets, operating loss, and other carryforwards  
Deferred tax asset, U.S. foreign tax credit $ 7,027
Deferred tax assets, foreign and state NOL 16,655
Net operating loss (NOL) carryforwards 58,110
Other deductible carryforwards 16,817
NOL and other carryforwards  
Deferred tax assets, operating loss, and other carryforwards  
Deferred tax assets, valuation allowance $ 6,192
Foreign tax credit carryforwards | Earliest Tax Year  
Deferred tax assets, operating loss, and other carryforwards  
Expiration date 2023
Foreign tax credit carryforwards | Latest Tax Year  
Deferred tax assets, operating loss, and other carryforwards  
Expiration date 2026