Consolidated Statements of Comprehensive Income (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Consolidated Statements of Comprehensive Income (unaudited) [Abstract]
Net income	$ 8,769	$ 3,574	$ 29,418	$ 17,016
Other comprehensive (loss)/income:
Foreign currency translation adjustments	(15,172)	4,700	(14,610)	1,816
Interest rate swap agreement, net of tax of $39, ($17), $74 and $88 at respective dates	74	(32)	140	163
Pension plan amortization of net actuarial loss and prior service cost, net of tax of $70, $106, $210 and $337 at respective dates	143	241	433	705
Comprehensive (loss)/income	$ (6,186)	$ 8,483	$ 15,381	$ 19,700