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Subsequent Events Subsequent Events (Details) - USD ($)
 3 Months Ended
Feb. 09, 2016
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mar. 19, 2014
Line of Credit Facility [Line Items]                                                
Principal amount                                           $ 208,466,000    
Line of credit facility, current borrowing capacity                                           325,000,000    
Revolving Credit Facility                                                
Line of Credit Facility [Line Items]                                                
Line of credit facility, potential increase to borrowing capacity                                           50,000,000    
Line of credit facility, current borrowing capacity                                           200,000,000    
Credit Facility, Term Note                                                
Line of Credit Facility [Line Items]                                                
Line of credit facility, current borrowing capacity                                           125,000,000    
Convertible subordinated notes                                                
Line of Credit Facility [Line Items]                                                
Principal amount                                           $ 143,750,000 $ 143,750,000 $ 143,750,000
Subsequent Event | Revolving Credit Facility                                                
Line of Credit Facility [Line Items]                                                
Line of credit facility, potential increase to borrowing capacity $ 75,000,000                                              
Line of credit facility, current borrowing capacity 150,000,000                                              
Subsequent Event | Credit Facility, Term Note                                                
Line of Credit Facility [Line Items]                                                
Line of credit facility, current borrowing capacity $ 150,000,000                                              
Subsequent Event | Line of Credit                                                
Line of Credit Facility [Line Items]                                                
Reduction of LIBOR based variable interest rate 37.50%                                              
Days prior to the maturity of any subordinated debt the Credit Agreement matures 91 days                                              
Scenario, Forecast | Subsequent Event | Credit Facility, Term Note                                                
Line of Credit Facility [Line Items]                                                
Repayments of Credit Agreement   $ 4,690,000 $ 4,690,000 $ 4,690,000 $ 3,750,000 $ 3,750,000 $ 3,750,000 $ 3,750,000 $ 3,750,000 $ 3,750,000 $ 3,750,000 $ 3,750,000 $ 3,750,000 $ 2,810,000 $ 2,810,000 $ 2,810,000 $ 2,810,000 $ 2,810,000 $ 2,810,000 $ 2,810,000 $ 2,810,000