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CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Statement Of Financial Position [Abstract]    
Contingently redeemable common stock, issued shares 0us-gaap_TemporaryEquitySharesIssued 1,000,000us-gaap_TemporaryEquitySharesIssued
Contingently redeemable common stock, outstanding shares 0us-gaap_TemporaryEquitySharesOutstanding 1,000,000us-gaap_TemporaryEquitySharesOutstanding
Cumulative convertible preferred stock, par value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Cumulative convertible preferred stock, shares authorized 1,000,000us-gaap_PreferredStockSharesAuthorized 1,000,000us-gaap_PreferredStockSharesAuthorized
Cumulative convertible preferred stock, shares issued 12,000us-gaap_PreferredStockSharesIssued 12,000us-gaap_PreferredStockSharesIssued
Cumulative convertible preferred stock, shares outstanding 12,000us-gaap_PreferredStockSharesOutstanding 12,000us-gaap_PreferredStockSharesOutstanding
Cumulative convertible preferred stock, minimum liquidation preference $ 8.49us-gaap_PreferredStockLiquidationPreference $ 8.49us-gaap_PreferredStockLiquidationPreference
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 55,000,000us-gaap_CommonStockSharesAuthorized 55,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 45,224,000us-gaap_CommonStockSharesIssued 43,769,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 35,557,000us-gaap_CommonStockSharesOutstanding 34,102,000us-gaap_CommonStockSharesOutstanding
Treasury stock, shares 9,667,000us-gaap_TreasuryStockShares 9,667,000us-gaap_TreasuryStockShares