Consolidated Statements of Comprehensive Income/(Loss) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income		$ 51,565	$ 32,445	$ 48,097
Other comprehensive income/(loss):
Unrealized gain/(loss) on effective cash flow hedges, net of taxes ($402), $1,768 and ($1,840), respectively		(709)	5,002	(7,759)
Foreign currency translation adjustment		(12,510)	(5,462)	(19,605)
Retirement benefits, net of taxes $22, ($28) and ($91), respectively		584	(34)	(331)
Reclassification adjustments
Realized loss on cash flow hedges, net of taxes $456, $1,571 and $1,625, respectively(1)	[1]	661	5,569	3,516
Retirement benefits, net of taxes $53, $15 and $31, respectively(2)	[2]	158	134	108
Total other comprehensive (loss)/income		(11,816)	5,209	(24,071)
Total comprehensive income		$ 39,749	$ 37,654	$ 24,026

[1] These are reclassified to net income and are included in the foreign exchange gain/(loss) in the 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 consolidated statements of income. See Note 11 to the consolidated financial statements.