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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Phantom and restricted stock issuances (in shares) 117,895us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures 393,818us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures 11,323us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
Stock options exercised (in shares) 4,337us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 22,095us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Share repurchase (in shares)     13,948,687us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Common stock issued upon exchange of convertible securities (in shares) 0us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities 3,664,729us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities 1,323,322us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
Common Stock, Dividends, Per Share, Cash Paid $ 0.24us-gaap_CommonStockDividendsPerShareCashPaid $ 0us-gaap_CommonStockDividendsPerShareCashPaid $ 0us-gaap_CommonStockDividendsPerShareCashPaid