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Equity-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
EquityBasedCompensationTablesAbstract  
Nonvested Units Outstanding Table
 
 
Units
 
Weighted Average
Grant Date Fair
Value Per Unit
 
 
(In Thousands)
 
 
Nonvested units outstanding at December 31, 2013
 
155

 
$
17.52

Units granted(1)
 
209

 
22.89

Units cancelled
 
(21
)
 
18.97

Units vested
 
(74
)
 
18.27

Adjustment for performance results achieved
 
(6
)
 
24.00

Nonvested units outstanding at December 31, 2014
 
263

 
$
21.90