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Shareholders' Equity Part 2 (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Loss              
Balance at the beginning of the year     $ (49,923) $ (48,129) $ (48,129) $ (38,593)  
Other comprehensive income (loss) before reclassifications     11,231   (2,006)    
Amounts reclassified from Accumulated Other Comprehensive Loss     10,266   212    
Net current period other comprehensive income (loss) $ (8,188) $ (427) (21,497) (4,186) 1,794 9,536 $ 13,622
Balance at the end of the year (28,426)   (28,426)   (49,923) (48,129) $ (38,593)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]              
Accumulated Other Comprehensive Loss              
Balance at the beginning of the year     (44,444) (44,585) (44,585)    
Other comprehensive income (loss) before reclassifications     25,073   141    
Amounts reclassified from Accumulated Other Comprehensive Loss     0   0    
Net current period other comprehensive income (loss)     (25,073)   (141)    
Balance at the end of the year (19,371)   (19,371)   (44,444) (44,585)  
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]              
Accumulated Other Comprehensive Loss              
Balance at the beginning of the year     (5,391) (3,647) (3,647)    
Other comprehensive income (loss) before reclassifications     361   (1,815)    
Amounts reclassified from Accumulated Other Comprehensive Loss     20   71    
Net current period other comprehensive income (loss)     (381)   1,744    
Balance at the end of the year (5,010)   (5,010)   (5,391) (3,647)  
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]              
Accumulated Other Comprehensive Loss              
Balance at the beginning of the year     (88) $ 103 103    
Other comprehensive income (loss) before reclassifications     (14,203)   (332)    
Amounts reclassified from Accumulated Other Comprehensive Loss     10,246   141    
Net current period other comprehensive income (loss)     3,957   191    
Balance at the end of the year $ (4,045)   $ (4,045)   $ (88) $ 103