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Equity, Stock Repurchase Program, Dividends, and Shelf Registration (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Sep. 16, 2019
Apr. 16, 2019
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, 2019
Dec. 31, 2018
Nov. 30, 2019
May 31, 2019
Apr. 23, 2018
Stock Repurchase Program [Abstract]                              
Shares repurchased (in shares) 70,000 1,200,000                          
Average price per share of repurchased shares (in dollars per share) $ 20.07 $ 21.00                          
Dividends Payable [Line Items]                              
Dividends declared (in dollars per share)     $ 0.02 $ 0.02 $ 0.02 $ 0.02 $ 0.02 $ 0.02 $ 0.02 $ 0.02 $ 0.08 $ 0.08      
Dividend cost                     $ 2.2 $ 2.3      
Debt Instrument [Line Items]                              
Maximum amount of debt and equity to be issued under Shelf Registration                             $ 500.0
Common Class A [Member]                              
Stock Repurchase Program [Abstract]                              
Number of shares authorized to be repurchased (in shares)                         1,000,000 1,212,759  
Common Class A [Member] | Stock Repurchase Program [Member]                              
Stock Repurchase Program [Abstract]                              
Shares repurchased (in shares)                     551,675 419,995      
Average price per share of repurchased shares (in dollars per share)                     $ 18.99 $ 25.25      
Share available under program to repurchase (in shares)     1,243,135               1,243,135