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Stockholders' Equity - Stock Repurchase Program (Details) - $ / shares
3 Months Ended 9 Months Ended 19 Months Ended 83 Months Ended
Mar. 12, 2020
Oct. 23, 2014
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2021
Shares Related to Withholding Taxes on the Vesting of Restricted Stock                
Stockholders Equity (Textual) [Abstract]                
Number of shares repurchased (in shares)     220 378 26,023 28,306    
Eleventh Stock Repurchase Plan                
Stockholders Equity (Textual) [Abstract]                
Outstanding share percent   5.00%            
Outstanding common shares in the plan (in shares)   1,512,600            
Twelfth Stock Repurchase Plan                
Stockholders Equity (Textual) [Abstract]                
Outstanding share percent 5.00%              
Outstanding common shares in the plan (in shares) 1,799,054              
Eleventh Stock Repurchase Plan                
Stockholders Equity (Textual) [Abstract]                
Number of shares repurchased (in shares)     0 0 0 639,922    
Net Total Stock Repurchased During Periods Presented, Shares               1,512,600
Net Stock Repurchased During Periods Presented, Value Per Share     $ 0 $ 0 $ 0 $ 23.95   $ 21.69
Twelfth Stock Repurchase Plan                
Stockholders Equity (Textual) [Abstract]                
Number of shares repurchased (in shares)     841,088 0 841,088 155,778    
Net Total Stock Repurchased During Periods Presented, Shares             996,866  
Net Stock Repurchased During Periods Presented, Value Per Share     $ 24.54 $ 0 $ 24.54 $ 20.34 $ 23.88