Income Taxes - Reconciliation of Income Tax Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of income tax expense:
Computed income tax expense at statutory federal income tax rate of 35%	$ 10,201	$ 9,381	$ 4,613
State income taxes, net of federal provision	345	470	(100)
Foreign tax rate differentials	77	(2,031)	(1,679)
U.S. tax on foreign earnings U.S. tax on foreign earnings (net of foreign tax credits)	(1,831)	(595)	1,105
Tax resolutions, net	0	0	(103)
Change in valuation allowance	(2,184)	14,220	(55)
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	1,664	(371)	(43)
Proceeds from life insurance	(196)	(472)	0
Other, net	514	241	150
Income tax expense	$ 8,590	$ 20,843	$ 3,888
Computed income tax expense at statutory federal income tax rate of 35%, tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal provision, tax rate	1.20%	1.80%	(0.80%)
Foreign tax differentials rate	0.30%	(7.60%)	(12.70%)
U.S. tax on foreign earnings rate	(6.30%)	(2.20%)	8.40%
Tax resolutions, net tax rate	0.00%	0.00%	(0.80%)
Change in valuation allowance, tax rate	(7.50%)	53.10%	(0.40%)
Proceeds from life insurance rate	(0.70%)	(1.80%)	0.00%
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent	5.70%	(1.40%)	(0.30%)
Other, net, tax rate	1.80%	0.90%	1.10%
Income tax expense	29.50%	77.80%	29.50%