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Leases - Sale-leaseback transaction (Details 4) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2014
Sale-leaseback transaction      
Sale-leaseback transaction gain $ 10,300,000us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized $ 10,334,000us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized  
Sale-leaseback transaction, deferred gain      
Sale-leaseback transaction gain, deferred 4,500,000us-gaap_SaleLeasebackTransactionDeferredGainGross 4,500,000us-gaap_SaleLeasebackTransactionDeferredGainGross  
Amortization period of deferred gain on sale 6 years    
Accrued Liabilities [Member]      
Sale-leaseback transaction, deferred gain      
Sale-leaseback transaction gain, recorded     764,625us-gaap_SaleLeasebackTransactionDeferredGainNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
Other Noncurrent Liabilities [Member]      
Sale-leaseback transaction, deferred gain      
Sale-leaseback transaction gain, recorded     $ 2,250,237us-gaap_SaleLeasebackTransactionDeferredGainNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember