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Equity-based Compensation Plan (Summary of the restricted units' activity under the Omnibus Plan) (Details) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward      
Restricted units - Beginning of period 153,050 158,750 197,500
Restricted units granted 26,700 39,200 85,700
Restricted units lapsed 39,750 37,342 113,367
Restricted stock forfeited 1,600 7,558 11,083
Restricted units - End of period 138,400 153,050 158,750
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value RollForward      
Weighted average grant date - Beginning Of Period $ 14.95 $ 13.95 $ 12.13
Weighted average grant date - Granted 16.66 16.1 15.86
Weighted average grant date - Lapsed 11.83 12.03 12.34
Weighted average grant date - Forfeited 15.45 14.3 12.87
Weighted average grant date - End Of Period $ 16.17 $ 14.95 $ 13.95