Long-term Debt, Line of Credit and Derivatives - Provisions of Revolving Line of Credit and Accordion (Details) - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Repayments of debt	$ 59,460,000	$ 21,361,000
Proceeds from Lines of Credit	$ 49,000,000	$ 29,861,000
Line of Credit Facility
Debt Instrument [Line Items]
Weighted average interest rate	5.86%
Revolving Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 50,000,000
Revolving Line of Credit | Line of Credit Facility
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
Fair value of amount outstanding	32,000,000
Line of credit facility, remaining borrowing capacity	17,200,000
Repayments of debt	39,000,000
Net increase in remaining borrowing capacity	10,000,000
Proceeds from Lines of Credit	49,000,000
Revolving Line of Credit | Line of Credit Facility | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Fair value of amount outstanding	$ 28,000,000
Weighted average interest rate	5.56%
Revolving Line of Credit | Line of Credit Facility | Base Rate
Debt Instrument [Line Items]
Fair value of amount outstanding	$ 4,000,000
Stated interest rate	7.50%
Letter of Credit | Line of Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 20,000,000
Letters of credit outstanding, amount	800,000
Swingline Loan | Line of Credit Facility
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
Term Loan | Line of Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 60,000,000
Fair value of amount outstanding	$ 38,000,000