Notes Payable - Summary of Notes Payable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	[1]	Jun. 30, 2016	[1]	Mar. 31, 2016	[1]	Dec. 31, 2015		Sep. 30, 2015	[1]	Jun. 30, 2015	[1]	Mar. 31, 2015	[1]
Debt Instrument [Line Items]
Payments/Long term debt, Total	$ 51,823							$ 49,110
Less current portion	(1,227)	$ (986)		$ (1,044)		$ (1,253)		(775)	[1]	$ (1,412)		$ (800)		$ (932)
Long term portion	50,596							48,335
Credit Facility [Member]
Debt Instrument [Line Items]
Payments/Long term debt, Total	$ 46,000							44,000
Average effective interest rate	2.50%
3.25 % through 3.5 % notes payable due in next year [Member]
Debt Instrument [Line Items]
Payments/Long term debt, Total	$ 5,823							$ 5,110
Annual installments	$ 1,227
3.25 % through 3.5 % notes payable due in next year [Member] | Maximum [Member]
Debt Instrument [Line Items]
Percentage of interest accrued	3.50%
3.25 % through 3.5 % notes payable due in next year [Member] | Minimum [Member]
Debt Instrument [Line Items]
Percentage of interest accrued	3.25%

[1] as restated