Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Derivative Instruments, Hedging Activities and Fair Value - Effect of Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	$ 866	$ 1,926	$ 8,026	$ 23
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	(58)	252	(1,274)	560
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	0	(103)		(420)
Accumulated other comprehensive loss	(555,291)		(555,291)		$ (548,102)	$ (546,582)
Foreign currency exchange forward contracts
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	(410)	2,333	1,369	3,096
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	0	0
Foreign currency exchange forward contracts \| Cost of services and products sold
Effect of derivative instruments
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	(3)	0	(112)	(185)
Derivatives Not Designated as Hedging Instruments
Amount of Gain (Loss) Recognized in Income on Derivative	3,194	(7,025)	13,459	(18,764)
Interest rate swaps
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	1,276	(335)	6,657	(2,878)
Interest rate swaps \| Interest Expense [Member]
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	(367)		(602)
Cross currency interest rate swaps
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	0	(72)	0	(195)
Cross currency interest rate swaps \| Cost of services and products sold
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	0	(103)	0	(420)
Cross currency interest rate swaps \| Interest Expense [Member]
Effect of derivative instruments
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	312	$ 252	960	$ 745
Accounting Standards Update 2014-09 \| Difference between Revenue Guidance in Effect before and after Topic 606
Effect of derivative instruments
Accumulated other comprehensive loss	$ 1,679		$ 1,679		$ (1,520)