Shareholders' Equity Part 2 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Loss
Balance at the beginning of the year	$ (22,323)	$ (49,923)
Other comprehensive income (loss) before reclassifications	(5,635)
Amounts reclassified from Accumulated Other Comprehensive Loss	(7,973)
Tax Cuts And Jobs Act of 2017 Reclassification From AOCI to Retained Earnings	(1,263)
Net current period other comprehensive income (loss)	14,871	(27,600)	$ 1,794
Balance at the end of the year	(37,194)	(22,323)	$ (49,923)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Loss
Balance at the beginning of the year	(15,778)
Other comprehensive income (loss) before reclassifications	(16,053)
Amounts reclassified from Accumulated Other Comprehensive Loss	0
Tax Cuts And Jobs Act of 2017 Reclassification From AOCI to Retained Earnings	0
Net current period other comprehensive income (loss)	16,053
Balance at the end of the year	(31,831)	(15,778)
Pension and Postretirement Benefits
Accumulated Other Comprehensive Loss
Balance at the beginning of the year	(1,610)
Other comprehensive income (loss) before reclassifications	1,293
Amounts reclassified from Accumulated Other Comprehensive Loss	122
Tax Cuts And Jobs Act of 2017 Reclassification From AOCI to Retained Earnings	(137)
Net current period other comprehensive income (loss)	(1,278)
Balance at the end of the year	(332)	(1,610)
Cash Flow Hedge
Accumulated Other Comprehensive Loss
Balance at the beginning of the year	(4,935)
Other comprehensive income (loss) before reclassifications	9,125
Amounts reclassified from Accumulated Other Comprehensive Loss	(8,095)
Tax Cuts And Jobs Act of 2017 Reclassification From AOCI to Retained Earnings	(1,126)
Net current period other comprehensive income (loss)	96
Balance at the end of the year	$ (5,031)	$ (4,935)