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Long-Term Debt - Additional Information (Details)
1 Months Ended 6 Months Ended 12 Months Ended
Nov. 08, 2018
USD ($)
Nov. 15, 2013
USD ($)
Jun. 30, 2019
USD ($)
Apr. 30, 2019
USD ($)
Feb. 28, 2019
USD ($)
Oct. 31, 2017
USD ($)
May 31, 2017
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]                    
Proceeds from 2013 term loan facility               $ 0 $ 2,380,000  
Debt instrument, face amount         $ 2,000,000   $ 5,000,000      
Repayments of outstanding loan       $ 6,900,000            
Debt instrument, periodic payment, percentage of principal             1.00%      
Debt instrument, periodic payment of principal             $ 70,000      
Dividends paid           $ 35,000,000        
Proceeds from borrowings on Revolving Loan Facility               9,500,000 $ 0  
LIBOR                    
Debt Instrument [Line Items]                    
Basis spread on variable rate         9.55%          
Secured Debt                    
Debt Instrument [Line Items]                    
Debt, unamortized discount                   $ 1,936,000
Loan facility balance, net of unamortized debt discount     $ 177,280,000         177,280,000    
Letter of Credit                    
Debt Instrument [Line Items]                    
Letters of credit outstanding     $ 1,974,000         1,974,000    
2013 Senior Credit Facility | Line of Credit                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity   $ 370,000,000                
Maximum percentage available on line of credit due to exceeded maximum leverage ratio 25.00%                  
Maximum available amount on line of credit $ 11,250,000                  
Debt instrument, periodic payment of principal       $ 18,138,000            
Threshold from sale of assets used towards mandatory prepayments               $ 30,000,000    
Excess cash flow                   36,276,000
2013 Senior Credit Facility | Line of Credit | Leverage Ratio, Dividend Payment                    
Debt Instrument [Line Items]                    
Maximum leverage ratio     4.00         4.00    
2013 Senior Credit Facility | Line of Credit | Leverage Ratio, Greater Than 2.50                    
Debt Instrument [Line Items]                    
Maximum leverage ratio     2.5         2.5    
Excess cash flow repayment, percentage     50.00%         50.00%    
2013 Senior Credit Facility | Line of Credit | Leverage Ratio, Greater than 2.00 but Less than 2.50                    
Debt Instrument [Line Items]                    
Maximum leverage ratio     2         2    
Excess cash flow repayment, percentage     25.00%         25.00%    
2013 Senior Credit Facility | Line of Credit | Leverage Ratio, Less Than or Equal to 2.00                    
Debt Instrument [Line Items]                    
Excess cash flow repayment, percentage     0.00%         0.00%    
2013 Senior Credit Facility | Line of Credit | Base Rate                    
Debt Instrument [Line Items]                    
Basis spread on variable rate   2.50%                
2013 Senior Credit Facility | Line of Credit | LIBOR                    
Debt Instrument [Line Items]                    
Basis spread on variable rate   3.50%                
2013 Term Loan Facility | Secured Debt                    
Debt Instrument [Line Items]                    
Outstanding principal balance   $ 325,000,000 $ 179,177,000         $ 179,177,000   197,835,000
Proceeds from 2013 term loan facility   $ 323,375,000                
Debt instrument, discount percentage   0.50%                
Debt, unamortized discount   $ 1,625,000 1,434,000         $ 1,434,000    
Percent of amendment fee paid to consenting lenders               0.25%    
Principal payment on term loan facility               $ 18,658,000    
Term after which excess cash flow is paid               95 days    
Unamortized debt issuance costs     463,000         $ 463,000    
2013 Term Loan Facility | Secured Debt | Level 2                    
Debt Instrument [Line Items]                    
Fair market value of debt     $ 173,343,000         $ 173,343,000   $ 183,987,000
Long term debt fair value, percentage     97.00%         97.00%   93.00%
2013 Term Loan Facility | Secured Debt | Base Rate                    
Debt Instrument [Line Items]                    
Variable rate floor   2.00%                
2013 Term Loan Facility | Secured Debt | LIBOR                    
Debt Instrument [Line Items]                    
Variable rate floor   1.00%                
2013 Revolving Loan Facility                    
Debt Instrument [Line Items]                    
Unutilized portion of the 2013 Revolving Loan Facility     $ 3,041,000         $ 3,041,000    
2013 Revolving Loan Facility | Leverage Ratio, Dividend Payment                    
Debt Instrument [Line Items]                    
Maximum leverage ratio     4.00         4.00    
2013 Revolving Loan Facility | Line of Credit                    
Debt Instrument [Line Items]                    
Proceeds from borrowings on Revolving Loan Facility               $ 9,500,000    
2013 Revolving Loan Facility | Secured Debt                    
Debt Instrument [Line Items]                    
Outstanding principal balance     $ 9,500,000         9,500,000   $ 0
2013 Revolving Loan Facility | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity   $ 15,000,000                
Maximum available portion currently available revolving facility 20.00%                  
Maximum utilization, amount $ 3,000,000                  
Minimum leverage ratio 4.00                  
Maximum leverage ratio 4.5                  
2013 Revolving Loan Facility | Letter of Credit                    
Debt Instrument [Line Items]                    
Letters of credit outstanding     2,459,000         2,459,000    
TSI Group                    
Debt Instrument [Line Items]                    
Cash balance     10,788,000         $ 10,788,000    
Minimum | 2013 Revolving Loan Facility | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Available portion currently available revolving facility $ 15,000,000                  
Maximum | 2013 Revolving Loan Facility | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Available portion currently available revolving facility $ 45,000,000                  
TSI Holdings                    
Debt Instrument [Line Items]                    
Dividends paid     $ 16,000,000