Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Defined benefit pension plans:
Tax provision	$ 1,065		$ 1,167
Reclassification out of Accumulated Other Comprehensive Income [Member]
Defined benefit pension plans:
Total reclassifications	382
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Defined benefit pension plans:
Amortization of actuarial loss	620	[1]
Tax provision	$ (238)

[1] Amortization of actuarial loss on our defined benefit pension plans is included in the computation of net periodic pension(credit) for the three months ended March 31, 2013. See Note 7, "Benefit Plans" for additional information.