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Income Taxes - Narrative and Changes in Unrecognized Tax Benefits (Details) - USD ($)
12 Months Ended 48 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2015
Income Taxes          
Undistributed earnings and profits of foreign subsidiaries that would be subject to U.S. taxes         $ 51,000,000
Unrecognized tax benefits $ 14,869,000 $ 7,682,000 $ 5,474,000 $ 14,722,000 14,722,000
Unrecognized tax benefits, decrease resulting from foreign currency translation 700,000        
Interest and penalties related to unrecognized tax benefits 300,000 0 0 500,000  
Changes in the balance of the entity's unrecognized tax benefits          
Balance at the beginning of the period 14,869,000 7,682,000 5,474,000    
Increases (decreases) related to prior year tax positions (599,000) 71,000 51,000    
Increases related to current year tax positions 1,775,000 7,116,000 2,157,000    
Decreases related to settlements with tax authorities (1,135,000)        
Lapse of statute of limitations (188,000)        
Balance at the end of the period 14,722,000 $ 14,869,000 $ 7,682,000 $ 14,722,000  
Federal          
Income Taxes          
NOL         47,000,000
Tax credit carryforward         23,000,000
Annual usage limitation on NOL $ 2,000,000        
Foreign          
Income Taxes          
NOL         $ 57,000,000
Percentage of NOL carryforwards which may expire 53.00%