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Income Per Class A Unit (Parentheticals) (Details)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Per Class A Unit [Abstract]    
Weighted average Class A unit equivalents of excluded dilutive securities due to anti-dilutive effect 76us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 213us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount