Long-term Debt and Line of Credit - Provisions of the Revolving Line of Credit and Accordion (Details) - USD ($)	2 Months Ended	3 Months Ended	12 Months Ended
	Mar. 11, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Aug. 05, 2015
Debt Instrument [Line Items]
Repayments of debt			$ 63,084,000	$ 42,955,000	$ 1,557,000
Proceeds from lines of credit			57,000,000	$ 149,021,000	$ 30,000,000
Line of Credit
Debt Instrument [Line Items]
Stated interest rate						4.75%
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, amount outstanding		$ 8,000,000	8,000,000
Remaining borrowing capacity		40,700,000	$ 40,700,000
Repayments of debt		$ 53,000,000
Proceeds from lines of credit	$ 10,000,000
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						$ 50,000,000
Minimum additional borrowing amount						1,000,000
Amount over minimum additional borrowing amount, integral multiples						250,000
Stated interest rate		3.13%	3.13%
Revolving Credit Facility | Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						20,000,000
Letters of credit outstanding		$ 1,300,000	$ 1,300,000
Revolving Credit Facility | Bridge Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						5,000,000
Minimum additional borrowing amount						250,000
Amount over minimum additional borrowing amount, integral multiples						$ 50,000