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Long-Term Debt And Other Long-Term Liabilities (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]      
Credit facility maturity date 4/10/2020    
Credit Facility Maximum Credit Amount $ 900,000    
Origination, agency and syndication fees $ 2,600    
Debt instrument, variable interest rate, payable assessment period 90 days    
LIBOR interest rate plus one percent LIBOR plus 1.00%    
Line of credit facility, amount borrowed $ 281,000   $ 166,000
Current ratio of credit facility 1 to 1    
Leverage ratio of long-term debt 4 to 1    
Aggregate principal amount $ 650,000    
Interest percentage of senior subordinated notes 6.625%    
Debt Instrument, Maturity Date May 15, 2021    
Deducting fees for debt issuance $ 14,700    
Equal redemption price percentage of principal amount of debt 100.00%    
Senior notes repurchase price in percentage 101.00%    
Year One $ 16,600    
Year Two 5,700    
Year Three 59,900    
Year Four 9,500    
Year Five $ 290,000    
Number of compressors under capital lease agreement 20    
Capital lease term 7 years    
Capital Lease Obligations, Current $ 3,500    
Capital Lease Obligations, Noncurrent $ 18,900    
Discount rate capital leases 4.00%    
Maintenance $ 9,445    
Interest 2,698    
Capital leases, future minimum payments, average annual payment $ 4,000    
Capital lease fair market value percentage for purchase 10.00%    
Minimum      
Debt Instrument [Line Items]      
Commitment fee percentage under credit facility 0.375%    
LIBOR plus interest rate 1.75%    
Maximum      
Debt Instrument [Line Items]      
Commitment fee percentage under credit facility 0.50%    
LIBOR plus interest rate 2.50%    
Payments of dividends exceeding percentage 30.00%    
Line Of Credit Facility Commitment Amount]      
Debt Instrument [Line Items]      
Credit facility current credit amount $ 500,000    
Line Of Credit Facility Lender Determined Amount      
Debt Instrument [Line Items]      
Credit facility current credit amount $ 550,000 $ 725,000