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Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Changes in Accumulated Other Comprehensive Loss by Component [Abstract]                
Foreign currency translation, Beginning balance $ (64,832) $ (65,568) $ (67,895) $ (70,296)        
Foreign currency translation, Other comprehensive income (loss) before reclassifications 6,276 1,833 9,339 6,561        
Foreign currency translation, Amounts reclassified from accumulated other comprehensive loss            
Foreign currency translation, Net other comprehensive income (loss), net of tax 6,276 1,833 9,339 6,561        
Foreign currency translation, Reclassification of foreign currency translation associated with noncontrolling interest acquired (16,995)   (16,995)          
Foreign currency translation, Ending balance (75,551) (63,735) (75,551) (63,735)        
Unrealized gain (loss) on hedging activities, Beginning balance 299 (60) (18) 390        
Unrealized gain (loss) on hedging activities, Other comprehensive income (loss) before reclassifications 94 (33) 430 (527)        
Unrealized gain (loss) on hedging activities, Amounts reclassified from accumulated other comprehensive loss (101) 74 (120) 118        
Unrealized gain (loss) on hedging activities, Net other comprehensive income (loss), net of tax [1] (7) 41 310 (409)        
Unrealized gain (loss) on hedging activities, Ending balance 292 (19) 292 (19)        
Benefit plan liability, Beginning balance 84   84        
Benefit plan liability, Other comprehensive loss before reclassifications            
Benefit plan liability, Amounts reclassified from accumulated other comprehensive loss            
Benefit plan liability, Net other comprehensive income (loss), net of tax            
Benefit plan liability, Ending balance 84 84        
Total, Other comprehensive income (loss) before reclassifications 6,370 1,800 9,769 6,034        
Total, Amounts reclassified from accumulated other comprehensive loss (101) 74 (120) 118        
Net other comprehensive income (loss), net of tax 6,269 1,874 9,649 6,152        
Accumulated other comprehensive income (loss), net of tax, total $ (75,259) $ (63,670) $ (75,259) $ (63,670) $ (64,533) $ (67,913) $ (65,544) $ (69,822)
[1] Net of tax benefit of $(3) and $0 for the three months ended June 30, 2017 and 2016, respectively. Net of tax expense of $167 and $0 for the six months ended June 30, 2017 and 2016, respectively.