Income Taxes (Details) (USD $)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 1,178,000		$ 2,595,000	$ 4,095,000	$ 4,050,000
Effective tax rate	12.00%		27.50%	19.00%	22.90%
Unrecognized tax benefits, income tax penalties expense		400,000
Reversal of unrecognized tax benefits						500,000
Gross unrecognized tax benefits	3,400,000			3,400,000
Unrecognized tax benefits that would impact effective rate	2,900,000			2,900,000
Decrease in unrecognized tax benefits is reasonably possible in next 12 months	100,000			100,000
Accrued interest and penalties	100,000			100,000		100,000
Unrecognized tax benefits, income tax interest and penalties accrued, current	1,500,000			1,500,000
Unrecognized tax benefits, income tax penalties and interest accrued, noncurrent	$ 1,900,000			$ 1,900,000