Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income		$ 56,726	$ 48,888	[1],[2]	$ 61,733	[1],[2]
Other comprehensive (loss)/income:
Unrealized (loss)/gain on effective cash flow hedges, net of taxes ($3,888), $5,821 and $1,734, respectively		(10,031)	13,981		3,395
Foreign currency translation (loss)/gain		(25,700)	18,894		(9,236)
Retirement benefits, net of taxes $44, $164 and ($204), respectively		338	1,109		(439)
Reclassification adjustments
(Gain)/loss on cash flow hedges, net of taxes ($915), ($2,110) and ($1,190), respectively(1)	[3]	(2,234)	(4,789)		(1,479)
Retirement benefits, net of taxes ($23), $104 and $63, respectively(2)	[4]	(130)	152		27
Total other comprehensive (loss)/income		(37,757)	29,347		(7,732)
Total comprehensive income		$ 18,969	$ 78,235		$ 54,001

[1] Adjusted pursuant to adoption of ASU 2016-18, Statements of Cash Flows, Restricted Cash. Refer to Note 8 and Note 27 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.

[3] 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.

[4] These are reclassified to net income and are included in other income, net in the consolidated statements of income. Refer to Note 21 to the consolidated financial statements.