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Long-Term Debt - Additional Information (Details)
1 Months Ended 3 Months Ended
Mar. 16, 2020
USD ($)
Mar. 13, 2020
USD ($)
Jan. 02, 2020
USD ($)
Nov. 08, 2018
USD ($)
Sep. 30, 2017
USD ($)
Nov. 15, 2013
USD ($)
Jun. 30, 2019
USD ($)
Feb. 28, 2019
USD ($)
Oct. 31, 2017
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
May 31, 2017
USD ($)
Debt Instrument [Line Items]                          
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                   $ 12,500,000 $ (189,000)    
TSI Group                          
Debt Instrument [Line Items]                          
Cash balance                   885,000      
TSI Holdings                          
Debt Instrument [Line Items]                          
Dividends paid             $ 16,000,000            
LIBOR                          
Debt Instrument [Line Items]                          
Basis spread on variable rate               9.55%          
Secured Debt                          
Debt Instrument [Line Items]                          
Loan facility balance, net of unamortized debt discount                   176,497,000      
Letter of Credit                          
Debt Instrument [Line Items]                          
Letters of credit outstanding                   2,194,000      
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                  
Proceeds from borrowings on Revolving Loan Facility   $ 12,500,000                      
Threshold from sale of assets used towards mandatory prepayments                   $ 30,000,000      
2013 Senior Credit Facility | Line of Credit | Leverage Ratio, Greater Than 2.50                          
Debt Instrument [Line Items]                          
Maximum leverage ratio                   2.5      
Excess cash flow repayment, percentage                   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      
Excess cash flow repayment, percentage                   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%      
2013 Senior Credit Facility | Line of Credit | Leverage Ratio, Dividend Payment                          
Debt Instrument [Line Items]                          
Maximum leverage ratio                   4.00      
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       $ 177,286,000   $ 177,759,000  
Proceeds from 2013 term loan facility           $ 323,375,000              
Debt instrument, discount percentage           0.50%              
Debt, unamortized discount           $ (1,625,000)       $ (598,000)   (922,000)  
Percent of amendment fee paid to consenting lenders                   0.25%      
Principal payment on term loan facility                   $ 473,000      
Term after which excess cash flow is paid                   95 days      
Unamortized debt issuance costs                   $ 191,000      
2013 Term Loan Facility | Secured Debt | Level 2                          
Debt Instrument [Line Items]                          
Fair market value of debt                   $ 62,050,000   $ 133,319,000  
Long term debt fair value, percentage                   35.00%   75.00%  
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                   $ 353,000      
2013 Revolving Loan Facility | Leverage Ratio, Dividend Payment                          
Debt Instrument [Line Items]                          
Maximum leverage ratio                   4.00      
2013 Revolving Loan Facility | Line of Credit                          
Debt Instrument [Line Items]                          
Proceeds from borrowings on Revolving Loan Facility $ 12,500,000   $ 8,000,000                    
2013 Revolving Loan Facility | Secured Debt                          
Debt Instrument [Line Items]                          
Outstanding principal balance                   $ 12,500,000   $ 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 | Revolving Credit Facility | Maximum                          
Debt Instrument [Line Items]                          
Available portion currently available revolving facility       $ 45,000,000                  
2013 Revolving Loan Facility | Revolving Credit Facility | Minimum                          
Debt Instrument [Line Items]                          
Available portion currently available revolving facility       $ 15,000,000                  
2013 Revolving Loan Facility | Letter of Credit                          
Debt Instrument [Line Items]                          
Letters of credit outstanding                   $ 2,149,000