Quarterly report pursuant to Section 13 or 15(d)

Line of Credit - Additional Information (Details)

v3.4.0.3
Line of Credit - Additional Information (Details)
1 Months Ended 2 Months Ended 3 Months Ended
Mar. 31, 2016
USD ($)
Feb. 28, 2016
Mar. 31, 2016
USD ($)
Line of Credit Facility [Line Items]      
Revolving credit facility $ 80,000,000   $ 80,000,000
Revolving credit facility, maturity date     Jan. 02, 2017
Available borrowings for general corporate purposes 20,000,000   $ 20,000,000
Financial covenants, minimum net worth $ 250,000,000   $ 250,000,000
Financial covenants, percent of net income added to net worth requirement 50.00%   50.00%
Financial covenants, percent of proceeds from stock issuance added to net worth requirement 100.00%   100.00%
Financial covenants, maximum EBITDA ratio 3.0   3.0
Financial covenants, minimum interest coverage ratio 2.0   2.0
Revolving credit facility, borrowings outstanding $ 0   $ 0
Total outstanding letters of credit $ 20,500,000   20,500,000
Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Revolving credit facility, unused annual commitment fee 0.50% 0.25%  
Credit facility, unused portion $ 20,000,000   20,000,000
Letter of Credit      
Line of Credit Facility [Line Items]      
Revolving credit facility, unused annual commitment fee 2.00%    
Credit facility, unused portion $ 59,500,000   $ 59,500,000