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Income Per Class A Unit (Parentheticals) (Details)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Income Per Class A Unit [Abstract]        
Weighted average Class A unit equivalents of excluded dilutive securities due to anti-dilutive effect 159 968 184 1,016