Quarterly report pursuant to Section 13 or 15(d)

Line of Credit (Details)

v3.7.0.1
Line of Credit (Details)
3 Months Ended
Mar. 31, 2017
USD ($)
Line of Credit Facility [Line Items]  
Revolving credit facility $ 40,000,000.0
Financial covenants, minimum net worth $ 255,000,000.0
Financial covenants, percent of net income added to net worth requirement 50.00%
Financial covenants, percent of proceeds from stock issuance added to net worth requirement 100.00%
Financial covenants, assets held for sale reducing net worth requirement $ 30,000,000.0
Financial covenants, maximum EBITDA ratio 2.5
Financial covenants, minimum interest coverage ratio 2.0
Revolving credit facility, borrowings outstanding $ 0
Total outstanding letters of credit 4,600,000
Credit facility, unused portion $ 35,400,000
London Interbank Offered Rate (LIBOR) | Letter of Credit  
Line of Credit Facility [Line Items]  
Basis spread on variable rate 2.00%