Shareholders' Equity Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized loss on hedging instruments at January 1,			$ (196,305)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	$ (3,302)	$ 216	(5,799)	$ (2,207)
Total other comprehensive income (loss), net of tax	(12,705)	622	(10,749)	(14,768)
Net unrealized loss on hedging instruments at September 30,	(207,054)		(207,054)
Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized loss on hedging instruments at January 1,			(196,305)	(170,478)
OCI before reclassifications			(7,298)	(13,768)
Amounts reclassified from AOCI			(3,451)	(1,000)
Total other comprehensive income (loss), net of tax			(10,749)	(14,768)
Net unrealized loss on hedging instruments at September 30,	(207,054)	(185,246)	(207,054)	(185,246)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized loss on hedging instruments at January 1,			(157,489)	(128,648)
OCI before reclassifications			(13,544)	(18,538)
Amounts reclassified from AOCI			2,443	0
Total other comprehensive income (loss), net of tax			(11,101)	(18,538)
Net unrealized loss on hedging instruments at September 30,	(168,590)	(147,186)	(168,590)	(147,186)
Accumulated Other Comprehensive Income, Net Unrealized Gain (Loss) on Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized loss on hedging instruments at January 1,			1,201	966
OCI before reclassifications			4,995	4,770
Amounts reclassified from AOCI				(2,207)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax			(5,799)
Total other comprehensive income (loss), net of tax			(804)	2,563
Net unrealized loss on hedging instruments at September 30,	397	3,529	397	3,529
Accumulated Other Comprehensive Income, Net Unrealized Gain (Loss) on Nonderivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized loss on hedging instruments at January 1,			(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
Net unrealized loss on hedging instruments at September 30,	(14,380)	(14,380)	(14,380)	(14,380)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized loss on hedging instruments at January 1,			(25,637)	(28,416)
OCI before reclassifications			1,251	0
Amounts reclassified from AOCI			(95)	1,207
Total other comprehensive income (loss), net of tax			1,156	1,207
Net unrealized loss on hedging instruments at September 30,	$ (24,481)	$ (27,209)	$ (24,481)	$ (27,209)