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Unit-Based Compensation - Option and UAR Activity (Details) - Unit appreciation rights (UARs) - USD ($)
6 Months Ended
Jun. 30, 2015
Units (in shares)  
Outstanding 671,229
Granted 21,500
Forfeited (9,300)
Outstanding 683,429.000
Options and UARs exercisable 272,719
Weighted-Average Exercise Price (in dollars per share)  
Outstanding $ 26.97
Granted 11.12
Forfeited 24.42
Outstanding 26.51
Options and UARs exercisable $ 25.80
Weighted-Average Remaining Contractual Term  
Outstanding 4 years 8 months 17 days
Options and UARs exercisable 3 years 4 months 8 days
Aggregate Intrinsic Value  
Outstanding $ 0
Options and UARs exercisable $ 0