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Shareholders' Equity (Details) |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 19, 2015 USD ($) $ / shares shares | Mar. 13, 2008 right / shares shares / right firm | Dec. 31, 2014 USD ($) shares | Feb. 24, 2016 USD ($) | Dec. 31, 2015 USD ($) | Oct. 28, 2015 USD ($) | Apr. 23, 2013 USD ($)
Authorized stock repurchase amount |  |  |  |  | $ 150,000,000.0 | $ 150,000,000 | $ 100,000,000
Stock Repurchased During Period (in shares) | shares |  |  | 691,000 |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  | $ 61,600,000 |  |  |  |
Number of days for average common stock repurchase price | 20 days |  |  |  |  |  |
Remaining unused authorization for stock repurchase program |  |  |  |  | $ 11,900,000 |  |
Percent of common stock issued |  | 200.00% |  |  |  |  |
Number of investment banking firms consulting with company | firm |  | 1 |  |  |  |  |
Maximum percentage of companies assets, cash flow or earnings power before shareholders will lose right to exercise shares |  | 50.00% |  |  |  |  |
Class of Warrant or Right, Triggering Event, Repurchase, Beneficial Owner, Percentage |  | 50.00% |  |  |  |  |
Minimum |  |  |  |  |  |  |
Beneficial ownership percentage |  | 15.00% |  |  |  |  |
Common Stock | Common Stock |  |  |  |  |  |  |
Class or Warrant or Right, Percent of Common Stock Issued |  | 200.00% |  |  |  |  |
Class of Warrant or Right, Repurchase Rate | shares / right |  | 1 |  |  |  |  |
Common Stock | Series A Preferred Stock |  |  |  |  |  |  |
Class of Warrant or Right, Repurchase Rate | shares / right |  | 0.0001 |  |  |  |  |
Series A Preferred Stock | Common Stock |  |  |  |  |  |  |
Class of Warrant or Right, Issuance Rate | right / shares |  | 1 |  |  |  |  |
The Duchossois Group |  |  |  |  |  |  |
Stock Repurchased During Period (in shares) | shares | 945,000 |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value | $ 138,100,000 |  |  |  |  |  |
Repurchase price (in dollars per share) | $ / shares | $ 146.13 |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |
Authorized stock repurchase amount |  |  |  | $ 150,000,000.0 |  |  |

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