Fair Value Measurements (Narrative) (Details) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 Fixed price swap contracts gal	Jun. 30, 2014 First earn-out payment	Jun. 30, 2014 Second earn-out payment	Jun. 30, 2014 Prepaid Expenses and Other Assets Fixed price swap contracts	Dec. 31, 2013 Prepaid Expenses and Other Assets Fixed price swap contracts	Jun. 30, 2014 Accrued Expenses and Other Liabilities Fixed price swap contracts	Dec. 31, 2013 Accrued Expenses and Other Liabilities Fixed price swap contracts	Jun. 30, 2014 National Pump Accrued Expenses and Other Liabilities
Derivative [Line Items]
Derivative asset (Less than $1 as of June 30, 2014 and December 31, 2013)					$ 1,000,000	$ 1,000,000
Derivative liability (Less than $1 as of June 30, 2014 and December 31, 2013)							1,000,000	1,000,000
Fixed price swap contract (in gallons)		5,700,000
Average contract price (in dollars per gallon)		3.88
Average forward price (in dollars per gallon)		3.93
Contingent consideration									78,000,000
Discount rate	12.00%
Earn-out payments			$ 61,000,000	$ 17,000,000