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Investment in and Advances to Unconsolidated Affiliate Affiliate Balance Sheet (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Investments in and Advances to Affiliates, Affiliate Balance Sheet [Abstract]      
Equity Method Investment, Summarized Financial Information, Current Assets $ 25,882 $ 18,002  
Equity Method Investment-Property Plant & Equipment 133,021 151,434  
Equity Method Investment, Summarized Financial Information, Noncurrent Assets 80,407 80,665  
Equity Method Investment, Summarized Financial Information, Assets 239,310 250,101  
Equity Method Investment, Summarized Financial Information, Current Liabilities 14,468 46,966  
Equity Method Investment-Long-term Debt, Current Maturities 8,332 8,332  
Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities 28,039 32,426 50,000
Investment Affiliate-Other Liabilities 75 75  
Equity Method Investment Summarized Financial Information, Equity 188,396 162,302  
Equity Method Investment, Summarized Financial Information, Liabilities and Equity $ 239,310 $ 250,101