Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Unrealized gain/(loss) on effective cash flow hedges, tax		$ (3,888)	$ 5,821	$ 1,734
Retirement benefits, tax		44	164	(204)
Reclassification adjustment, realized (gain)/loss on cash flow hedges, tax	[1]	(915)	(2,110)	(1,190)
Reclassification adjustment, retirement benefits, tax	[2]	$ (23)	$ 104	$ 63

[1] These are reclassified to net income and are included either in cost of revenue or operating expenses, as applicable in the consolidated statements of income. Refer to Note 18 to the consolidated financial statements.

[2] Adjusted pursuant to adoption of ASU No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Post-retirement Benefit Cost. Refer to Note 21 and Note 27 to the consolidated financial statements.