Shareholders' Equity Part 2 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Loss
Balance at the beginning of the year	$ (48,129)	$ (38,593)
Other comprehensive income (loss) before reclassifications	(2,006)
Amounts reclassified from Accumulated Other Comprehensive Loss	212
Net current period other comprehensive income (loss)	1,794	9,536	$ 13,622
Balance at the end of the year	(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	(44,585)
Other comprehensive income (loss) before reclassifications	141
Amounts reclassified from Accumulated Other Comprehensive Loss	0
Net current period other comprehensive income (loss)	(141)
Balance at the end of the year	(44,444)	(44,585)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Loss
Balance at the beginning of the year	(3,647)
Other comprehensive income (loss) before reclassifications	(1,815)
Amounts reclassified from Accumulated Other Comprehensive Loss	71
Net current period other comprehensive income (loss)	1,744
Balance at the end of the year	(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	103
Other comprehensive income (loss) before reclassifications	(332)
Amounts reclassified from Accumulated Other Comprehensive Loss	141
Net current period other comprehensive income (loss)	191
Balance at the end of the year	$ (88)	$ 103