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Statement of Accounting Policies (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Accumlated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning balance   $ (11,688)     $ (11,688)      
Total other comprehensive income (loss) $ 2,125   $ 2,804   (20,885) $ 2,858    
Ending balance (32,573)       (32,573)      
Foreign Currency                
Accumlated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning balance (32,835) (9,825) 3,547 $ 3,493 (9,825) 3,493    
Other comprehensive income 2,125 (12,519) 2,804 54        
Amounts reclassified from accumulated other comprehensive income   (10,491)            
Total other comprehensive income (loss)   (23,010)            
Ending balance (30,710) (32,835) 6,351 3,547 (30,710) 6,351    
Defined Benefit Pension Plans                
Accumlated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning balance (1,863) (1,863) (1,066) (1,066) (1,863) (1,066)    
Other comprehensive income 0 0 0 0        
Amounts reclassified from accumulated other comprehensive income   0            
Total other comprehensive income (loss)   0            
Ending balance (1,863) (1,863) (1,066) (1,066) (1,863) (1,066)    
Accumulative Other Comprehensive Loss                
Accumlated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning balance (34,698) (11,688) 2,481 2,427 (11,688) 2,427    
Other comprehensive income 2,125 (12,519) 2,804 54        
Amounts reclassified from accumulated other comprehensive income   (10,491)            
Total other comprehensive income (loss)   (23,010)            
Ending balance (32,573) $ (34,698) $ 5,285 $ 2,481 (32,573) $ 5,285    
Carrying (Reported) Amount, Fair Value Disclosure | Less unamortized deferred financing fees                
Organization, Consolidation and Presentation of Financial Statements [Line Items]                
Notes Payable, Fair Value Disclosure 100,000       100,000     $ 100,000
Estimate of Fair Value, Fair Value Disclosure | Less unamortized deferred financing fees                
Organization, Consolidation and Presentation of Financial Statements [Line Items]                
Notes Payable, Fair Value Disclosure $ 104,200       $ 104,200   $ 106,800