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Debt - Narrative (Details)
4 Months Ended 12 Months Ended
Jan. 01, 2020
USD ($)
Sep. 04, 2019
Apr. 26, 2019
Jun. 22, 2017
USD ($)
Sep. 04, 2019
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2017
USD ($)
interest_rate_cap_agreement
Interest rate swap agreements                    
LONG-TERM DEBT                    
Amounts reclassified from accumulated other comprehensive income (loss) into income           $ 0        
Unrealized pre-tax (gain) loss on derivatives           915,000        
Interest rate cap agreements                    
LONG-TERM DEBT                    
Amounts reclassified from accumulated other comprehensive income (loss) into income           0        
Unrealized pre-tax (gain) loss on derivatives           1,058,000        
2017 Credit Agreement                    
LONG-TERM DEBT                    
Mandatory principal payment           $ 4,400,000        
2017 Credit Agreement, First Amendment                    
LONG-TERM DEBT                    
Fees related to debt amendment                 $ 6,021,000  
Debt covenant, net leverage ratio maximum           7.00        
Lines of Credit | 2017 Credit Agreement | Revolving Credit Facility                    
LONG-TERM DEBT                    
Revolving credit facility borrowings outstanding           $ 64,500,000        
Revolving credit facility maximum borrowing capacity       $ 100,000,000            
Incremental accordion facility amount       $ 125,000,000            
Incremental accordion feature percentage of EBITDA       100.00%            
Revolving credit facility commitment fee as a percentage           0.50%        
Debt covenant, net leverage ratio maximum           6.00        
Interest rate at period end           6.51%        
Lines of Credit | 2017 Credit Agreement, First Amendment | Revolving Credit Facility                    
LONG-TERM DEBT                    
Revolving credit facility commitment fee as a percentage         0.50%          
Lines of Credit | 2017 Credit Agreement, First Amendment | Eurodollar base rate | Revolving Credit Facility                    
LONG-TERM DEBT                    
Applicable margin         5.25%          
Lines of Credit | 2017 Credit Agreement, First Amendment | Base Rate | Revolving Credit Facility                    
LONG-TERM DEBT                    
Applicable margin         4.25%          
Lines of Credit | 2017 Credit Agreement, First Amendment | Alternate Base Rate Or London Interbank Offered Rate (LIBOR) | Revolving Credit Facility                    
LONG-TERM DEBT                    
Applicable margin, increase   1.75%                
Term loans | 2017 Credit Agreement                    
LONG-TERM DEBT                    
Debt face amount       $ 440,000,000            
Required prepayment           $ 0        
Quarterly installment payment       $ 1,100,000            
Interest rate at the end of the period           6.80%        
Term loans | 2017 Credit Agreement | Alternate base rate                    
LONG-TERM DEBT                    
Applicable margin       2.25%            
Term loans | 2017 Credit Agreement | LIBOR                    
LONG-TERM DEBT                    
Applicable margin       3.25%            
Term loans | 2017 Credit Agreement, First Amendment | Federal funds effective rate                    
LONG-TERM DEBT                    
Applicable margin         0.50%          
Term loans | 2017 Credit Agreement, First Amendment | Eurodollar base rate                    
LONG-TERM DEBT                    
Applicable margin   5.00%     1.00%          
Term loans | 2017 Credit Agreement, First Amendment | Alternate base rate                    
LONG-TERM DEBT                    
Applicable margin         4.50%          
Term loans | 2017 Credit Agreement, First Amendment | LIBOR                    
LONG-TERM DEBT                    
Applicable margin         5.50%          
Term loans | 2017 Credit Agreement, First Amendment | Base Rate                    
LONG-TERM DEBT                    
Applicable margin   4.00%                
Term loans | Term B Loans due September 2019                    
LONG-TERM DEBT                    
Debt face amount                   $ 440,000,000
Cash flow hedge | Designated as a hedge | Interest rate swap agreements                    
LONG-TERM DEBT                    
Interest rate swap agreements notional amount                   133,000,000
Unrealized pre-tax (gain) loss on derivatives             $ (892,000) $ 601,000    
Cash flow hedge | Designated as a hedge | Interest rate cap agreements                    
LONG-TERM DEBT                    
Interest rate swap agreements notional amount                   $ 147,000,000
Unrealized pre-tax (gain) loss on derivatives             $ 586,000 $ 884,000    
Number of interest rate swap agreements | interest_rate_cap_agreement                   2
Subsequent Event | Term loans | 2017 Credit Agreement                    
LONG-TERM DEBT                    
Mandatory principal payment $ 2,200,000                  
Debt Instrument, Redemption, Period One | Term loans | 2017 Credit Agreement, First Amendment                    
LONG-TERM DEBT                    
Debt redemption price, percentage     1.00%              
Debt Instrument, Redemption, Period Two | Term loans | 2017 Credit Agreement, First Amendment                    
LONG-TERM DEBT                    
Debt redemption price, percentage     2.00%