Derivative Financial Instruments Income Statement Effect of Derivative Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
derivative settlements	$ (21,949)	$ (24,250)	[1]	$ (21,843)	[2]
Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative settlements	(21,949)	(24,250)		(21,843)
Change in fair value	59,895	(15,150)		(20,310)
Re-measurement of Euro Notes (foreign currency transaction adjustment) - income (expense)	11,849	43,801		58,013
Derivative market value and foreign currency adjustments and derivative settlements - income (expense)	49,795	4,401		15,860
1:3 basis swaps [Member] | Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
derivative settlements	1,493	1,058		3,389
Change in fair value	(2,938)	12,292		36,824
Interest rate swaps - floor income hedges [Member] | Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
derivative settlements	(17,643)	(23,041)		(24,380)
Change in fair value	64,111	20,103		8,797
Interest rate swap option - floor income hedges [Member] | Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value	(281)	(2,420)		(3,409)
Interest rate swaps - hybrid debt hedges [Member] | Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
derivative settlements	(915)	(1,012)		(1,025)
Change in fair value	304	(295)		(5,233)
Interest Rate Cap [Member] | Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value	(419)	(1,365)		0
Cross-currency interest rate swaps [Member] | Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
derivative settlements	(4,884)	(1,255)		173
Change in fair value	(1,954)	(45,195)		(57,289)
Other [Member] | Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value	$ 1,072	$ 1,730		$ 0

[1] On December 31, 2015, the Company purchased Allo. The Allo assets acquired and liabilities assumed were recorded by the Company at their respective fair values at the date of acquisition. As such, Allo's assets and liabilities as of December 31, 2015 are included in the Company's consolidated balance sheet. However, Allo had no impact on the consolidated statement of income during 2015.

[2] Does not include the Communications segment, which was initiated as a result of the acquisition of Allo on December 31, 2015.