Annual report pursuant to Section 13 and 15(d)

Accounts Receivable-Related Parties (Narrative) (Details)

v2.4.0.8
Accounts Receivable-Related Parties (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Apr. 01, 2010
Windsor Niobrara LLC [Member]
Dec. 31, 2011
Other Nonoperating Income (Expense) [Member]
Orange Leaf Holdings, LLC [Member]
Related Party Transaction [Line Items]        
Accounts receivable-related parties $ 2,617 $ 34,848    
Rental income       $ 66
Affiliates participation percentage in acquisition of leases     50.00%