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Related Party Transactions (Narrative) (Details) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2014
Management [Member]
Investment [Member]
Cross Country Pipeline [Member]
Nov. 08, 2013
Management [Member]
Investment [Member]
Cross Country Pipeline [Member]
Mar. 31, 2014
Management [Member]
Lease Agreements [Member]
Cross Country Pipeline [Member]
Machinery and Equipment [Member]
Mar. 31, 2014
Management [Member]
Employee Leasing Arrangements [Member]
Related Customer [Member]
Mar. 31, 2013
Management [Member]
Employee Leasing Arrangements [Member]
Related Customer [Member]
Dec. 31, 2013
Management [Member]
Employee Leasing Arrangements [Member]
Related Customer [Member]
Mar. 31, 2014
Management [Member]
Service Agreements [Member]
Related Customer [Member]
Mar. 31, 2013
Management [Member]
Service Agreements [Member]
Related Customer [Member]
Dec. 31, 2013
Management [Member]
Service Agreements [Member]
Related Customer [Member]
Mar. 31, 2014
Management [Member]
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]
Other Long-Term Assets [Member]
Dec. 31, 2013
Management [Member]
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]
Other Long-Term Assets [Member]
Mar. 31, 2014
Board of Directors Chairman [Member]
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]
Mar. 31, 2013
Board of Directors Chairman [Member]
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]
Mar. 31, 2014
Chief Executive Officer [Member]
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]
Mar. 31, 2013
Chief Executive Officer [Member]
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]
Related Party Transaction [Line Items]                              
Cost method investment, original cost   $ 15,000,000                          
Cost method investments, additional information 14.85% ownership interest                            
Expenses from transactions with related party     900,000                        
Charges to related party       200,000 100,000                    
Due from related party       100,000   100,000                  
Revenue from related party             300,000 300,000              
Accounts receivable, related party             400,000   400,000            
Payments for life insurance policies                       0 0 0 0
Carrying amount, life insurance policies                   $ 10,100,000 $ 10,200,000