Shareholders' Equity Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	$ (229,327)
Total other comprehensive income (loss), net of tax	15,709	$ 7,182
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(401)	318
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(213,618)
Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(229,327)	(200,607)
OCI before reclassifications	15,076	7,245
Amounts reclassified from AOCI	633	(63)
Total other comprehensive income (loss), net of tax	15,709	7,182
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(213,618)	(193,425)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(182,986)	(158,009)
OCI before reclassifications	15,016	10,106
Amounts reclassified from AOCI	0	0
Total other comprehensive income (loss), net of tax	15,016	10,106
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(167,970)	(147,903)
Accumulated Other Comprehensive Income, Net Unrealized Gain (Loss) on Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	43	318
OCI before reclassifications	60	(2,782)
Amounts reclassified from AOCI	232	176
Total other comprehensive income (loss), net of tax	292	(2,606)
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	335	(2,288)
Accumulated Other Comprehensive Income, Net Unrealized Gain (Loss) on Nonderivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(14,380)	(14,380)
OCI before reclassifications	0	0
Amounts reclassified from AOCI	0	0
Total other comprehensive income (loss), net of tax	0	0
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(14,380)	(14,380)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(32,004)	(28,536)
OCI before reclassifications	0	(79)
Amounts reclassified from AOCI	401	(239)
Total other comprehensive income (loss), net of tax	401	(318)
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	$ (31,603)	$ (28,854)