Unaudited Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income		$ 16,050	$ 15,162	$ 46,245	$ 36,803
Other comprehensive income/(loss):
Unrealized gain/(loss) on effective cash flow hedges, net of taxes $1,067, ($822), $1,094 and ($727), respectively		2,540	(2,704)	3,066	(2,014)
Foreign currency translation adjustment		1,716	(7,092)	(2,652)	(9,926)
Retirement benefits, net of taxes $4, $71, $24 and $81, respectively		104	172	409	501
Reclassification adjustments
Realized (gain)/loss on cash flow hedges, net of taxes ($205), $175, ($386) and $393, respectively	[1]	(261)	255	(486)	570
Retirement benefits, net of taxes $1, $15, $3 and $31, respectively	[2]	22	36	64	128
Total other comprehensive income		4,121	(9,333)	401	(10,741)
Total comprehensive income		$ 20,171	$ 5,829	$ 46,646	$ 26,062

[1] These are reclassified to net income and are included in the foreign exchange gain/(loss) in the unaudited consolidated statements of income. See Note 7 to the unaudited consolidated financial statements.

[2] These are reclassified to net income and are included in the computation of net periodic pension costs in the unaudited consolidated statements of income. See Note 11 to the unaudited consolidated financial statements.