Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current
Current Federal	$ 21,916,000	$ 25,110,000	$ 16,723,000
Current State	3,731,000	1,627,000	2,438,000
Current Foreign	1,953,000	1,360,000	1,569,000
Current Income Tax Expense (Benefit)	27,600,000	28,097,000	20,730,000
Deferred
Deferred Federal	5,688,000	(455,000)	5,853,000
Deferred State	(270,000)	915,000	727,000
Deferred Foreign	(2,221,000)	(1,657,000)	(964,000)
Deferred Income Tax Expense (Benefit)	3,197,000	(1,197,000)	5,616,000
Total Income Tax Expense (Benefit)	30,797,000	26,900,000	26,346,000
Cash payments of income taxes, net of refunds	33,100,000	26,900,000	18,200,000
Income Tax Contingency [Line Items]
Federal Statutory Income Tax Rate		35.00%	35.00%
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense		100,000	100,000
Unrecognized Tax Benefits	2,302,000	3,886,000	4,388,000	3,907,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 1,700,000