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Benefit Plans - Stock Option Activity (Details) - Stock options - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Vesting period          
Expiration period     10 years    
Options Outstanding, Number of Shares          
Balance at the beginning of the period     1,525    
Options granted     0 0  
Options exercised     (23)    
Balance at the end of the period 1,502   1,502   1,525
Options Outstanding, Weighted average exercise price          
Balance at the beginning of the period (in dollars per share)     $ 12.24    
Options exercised (in dollars per share)     17.35    
Balance at the end of the period (in dollars per share) $ 12.17   $ 12.17   $ 12.24
Options Additional Disclosures          
Weighted average remaining contractual term     3 years 5 months 4 days   3 years 11 months 12 days
Aggregate intrinsic value, at the beginning of the period     $ 124,373    
Weighted average remaining contractual term of options vested and exercisable at the end of the period (years)     3 years 5 months 4 days    
Aggregate intrinsic value, at the end of the period $ 163,219   $ 163,219   $ 124,373
Options vested and exercisable at the end of the period (in shares) 1,502   1,502    
Options vested and exercisable at the end of the period, weighted average exercise price (in dollars per share) $ 12.17   $ 12.17    
Options vested and exercisable intrinsic value $ 163,219   $ 163,219    
Total intrinsic value of options exercised $ 1,409 $ 1,501 $ 2,080 $ 13,704  
Minimum          
Vesting period          
Vesting period     3 years    
Maximum          
Vesting period          
Vesting period     4 years