Income Taxes Components of Income Tax Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Components of Income Tax Expense [Line Items]
Current Federal Tax Expense (Benefit)	$ 10,508	$ 4,142	$ 6,502
Current Foreign Tax Expense (Benefit)	1,228	1,122	1,701
Current State and Local Tax Expense (Benefit)	2,145	1,443	1,704
Current Income Tax Expense (Benefit)	13,881	6,707	9,907
Deferred Federal Income Tax Expense (Benefit)	5,598	7,169	3,864
Deferred Foreign Income Tax Expense (Benefit)	(628)	(1,313)	(952)
Deferred State and Local Income Tax Expense (Benefit)	1,171	1,278	684
Net deferred income taxes	6,141	7,134	3,596
Provision for income taxes	$ 20,022	$ 13,841	$ 13,503