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Earnings per Common Share - Summary of Potential Common Stock Equivalents Excluded from Determination of Diluted Earnings Per Share (Details) - shares
shares in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Unvested Restricted Stock Awards [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive shares excluded from the determination of diluted earnings per share (in shares) 1.6 1.3
Warrants to Purchase Common Stock [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive shares excluded from the determination of diluted earnings per share (in shares)   0.1
Series A Preferred Stock [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive shares excluded from the determination of diluted earnings per share (in shares) [1] 46.5 46.5
[1] The Series A Preferred has no mandatory redemption date, but is redeemable at our election in year six for a 10% premium to the liquidation preference and for a 5% premium to the liquidation preference thereafter. If the Series A Preferred is not redeemed by the end of year twelve, the investors have the right to convert the Series A Preferred into TRC common stock. See Note 11 – Preferred Stock