Quarterly report pursuant to Section 13 or 15(d)

Accounting Standards (Details)

v3.20.2
Accounting Standards (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Oct. 01, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Decrease in retained earnings upon adoption $ 367,248 $ 351,111 $ 349,184   $ 343,550 $ 326,183 $ 308,835 $ 304,623 $ 299,469
Operating lease right-of-use assets 7,879                
Current portion of operating lease liabilities 2,379                
Operating lease liabilities, net of current portion 5,710                
Retained Earnings                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Decrease in retained earnings upon adoption $ 138,169 $ 122,422 $ 120,885   $ 115,646 $ 99,093 $ 81,891 $ 77,679 $ 72,525
Accounting Standards Update 2016-02                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Operating lease right-of-use assets       $ 9,100          
Current portion of operating lease liabilities       2,900          
Operating lease liabilities, net of current portion       6,400          
Accounting Standards Update 2016-02 | Retained Earnings                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Decrease in retained earnings upon adoption       $ (200)