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Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Changes in Accumulated Other Comprehensive Loss by Component [Abstract]                
Foreign currency translation, Beginning balance $ (75,551) $ (63,735) $ (67,895) $ (70,296)        
Foreign currency translation, Other comprehensive income (loss) before reclassifications 6,483 (638) 15,822 5,923        
Foreign currency translation, Amounts reclassified from accumulated other comprehensive loss            
Foreign currency translation, Net other comprehensive income (loss), net of tax 6,483 (638) 15,822 5,923        
Foreign currency translation, Reclassification of foreign currency translation associated with noncontrolling interest acquired     (16,995)          
Foreign currency translation, Ending balance (69,068) (64,373) (69,068) (64,373)        
Unrealized gain (loss) on hedging activities, Beginning balance 292 (19) (18) 390        
Unrealized gain (loss) on hedging activities, Other comprehensive income (loss) before reclassifications 36 (129) 466 (656)        
Unrealized gain (loss) on hedging activities, Amounts reclassified from accumulated other comprehensive loss (174) 65 (294) 183        
Unrealized gain (loss) on hedging activities, Net other comprehensive income (loss), net of tax [1] (138) (64) 172 (473)        
Unrealized gain (loss) on hedging activities, Ending balance 154 (83) 154 (83)        
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 (84)   (84)        
Benefit plan liability, Net other comprehensive income (loss), net of tax (84)   (84)        
Benefit plan liability, Ending balance        
Total, Other comprehensive income (loss) before reclassifications 6,519 (767) 16,288 5,267        
Total, Amounts reclassified from accumulated other comprehensive loss (174) (19) (294) 99        
Net other comprehensive income (loss), net of tax 6,345 (786) 15,994 5,366        
Accumulated other comprehensive income (loss), net of tax, total $ (68,914) $ (64,456) $ (68,914) $ (64,456) $ (75,259) $ (67,913) $ (63,670) $ (69,822)
[1] Net of tax benefit of $(74) and $0 for the three months ended September 30, 2017 and 2016, respectively. Net of tax expense of $93 and $0 for the nine months ended September 30, 2017 and 2016, respectively.