Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Accumulated other comprehensive income (loss) [Roll Forward]
Balance at January 1, 2012	$ (6,344)
Unrealized gains (losses)	(125)
Unrealized gains in fair value	123
Unrecognized amounts from defined benefit pension plans	748
Tax effect	(248)
Net of tax amount	498
Balance at June 30, 2012	(5,846)
Foreign currencty translation adjustments [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Balance at January 1, 2012	2,950
Unrealized gains (losses)	(125)
Unrealized gains in fair value	0
Unrecognized amounts from defined benefit pension plans	0
Tax effect	0
Net of tax amount	(125)
Balance at June 30, 2012	2,825
Interest rate cash flow hedges [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Balance at January 1, 2012	(77)
Unrealized gains (losses)	0
Unrealized gains in fair value	123
Unrecognized amounts from defined benefit pension plans	0
Tax effect	(46)
Net of tax amount	77
Balance at June 30, 2012	0
Defined benefit pension plans [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Balance at January 1, 2012	(9,217)
Unrealized gains (losses)	0
Unrealized gains in fair value	0
Unrecognized amounts from defined benefit pension plans	748
Tax effect	(202)
Net of tax amount	546
Balance at June 30, 2012	$ (8,671)