Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Income Tax Contingency [Line Items]
Income tax expense (benefit)	$ 2,509,000	$ 1,136,000	$ 2,917,000	$ 1,455,000
Effective tax rate	30.00%	18.10%	24.90%	17.70%
Unrecognized tax benefits, income tax penalties Expense	400,000
Reversal of unrecognized tax benefits		300,000		500,000
Gross unrecognized tax benefits	5,500,000		5,500,000
Unrecognized tax benefits that would impact effective rate	5,000,000		5,000,000
Decrease in unrecognized tax benefits is reasonably possible in next 12 months	100,000		100,000
Accrued interest and penalties	500,000		500,000		100,000
Unrecognized tax benefits, income tax interest and penalties accrued, current	3,600,000		3,600,000
Unrecognized tax benefits, income tax penalties and interest accrued, noncurrent	$ 1,900,000		$ 1,900,000
Federal Jusrisdiction [Member] | Minimum [Member]
Income Tax Contingency [Line Items]
Open tax year			2009
Federal Jusrisdiction [Member] | Maximum [Member]
Income Tax Contingency [Line Items]
Open tax year			2012
State Jurisdiction [Member] | Minimum [Member]
Income Tax Contingency [Line Items]
Open tax year			2008
State Jurisdiction [Member] | Maximum [Member]
Income Tax Contingency [Line Items]
Open tax year			2012
Non U.S Jurisdiction [Member] | Minimum [Member]
Income Tax Contingency [Line Items]
Open tax year			2006
Non U.S Jurisdiction [Member] | Maximum [Member]
Income Tax Contingency [Line Items]
Open tax year			2012