Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Significant Accounting Policies - Additional Information 1 (Details)

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Basis of Presentation and Significant Accounting Policies - Additional Information 1 (Details) - USD ($)
12 Months Ended
Dec. 31, 2014
Sep. 30, 2015
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Reclassification of debt issuance costs to interest bearing obligations current and long-term $ 1,859,000 [1] $ 2,878,000
Debt issuance costs 0  
Prior to Adoption of ASU 2015-03 [Member]    
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Reclassification of debt issuance costs to interest bearing obligations current and long-term $ 2,088,000 $ 3,069,000
[1] The condensed consolidated balance sheet as of December 31, 2014 has been derived from the audited consolidated financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.