Notes Payable and Revolving Line of Credit - 2015 Subordinated Debt Issuance - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Oct. 02, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Line Of Credit Facility [Line Items]
Proceeds from long-term debt		$ 100,218	$ 4,053	$ 9,150
Maturity Date		Aug. 31, 2019
Deferred debt issuance costs		$ 2,211
Long term debt		147,090
2.50% Subordinated Convertible Debt Maturing September 30, 2021
Line Of Credit Facility [Line Items]
Debt instrument, face amount	$ 25,000
Debt instrument, unused capacity	50,000
Proceeds from long-term debt	$ 25,000
Interest rate	2.50%
Maturity Date	Sep. 30, 2021
Conversion price per share	$ 30.00
Long term debt		$ 25,000
Debt instrument, interest rate		2.50%
12.0% Unsecured Subordinated Convertible Debt Maturing September 30, 2020
Line Of Credit Facility [Line Items]
Debt instrument, face amount	$ 25,000
Debt instrument, unused capacity	$ 25,000
Interest rate	12.00%
Maturity Date	Sep. 30, 2020
2015 Subordinated Debt Issuance [Member]
Line Of Credit Facility [Line Items]
Deferred debt issuance costs	$ 800