Unaudited Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income		$ 16,375	$ 12,074	$ 30,195	$ 21,641
Other comprehensive income/(loss):
Unrealized gain/(loss) on effective cash flow hedges, net of taxes ($376), ($358), $27 and $95, respectively		(1,508)	(1,116)	526	690
Foreign currency translation adjustment		(5,401)	(3,136)	(4,368)	(2,834)
Retirement benefits, net of taxes $15, $4, $20 and $10, respectively		123	178	305	329
Reclassification adjustments
Realized (gain)/loss on cash flow hedges, net of taxes ($156), $92, ($181) and $218, respectively	[1]	(193)	132	(225)	315
Retirement benefits, net of taxes $1, $13, $2 and $16, respectively	[2]	21	40	42	92
Total other comprehensive income		(6,958)	(3,902)	(3,720)	(1,408)
Total comprehensive income		$ 9,417	$ 8,172	$ 26,475	$ 20,233

[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 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 consolidated financial statements.