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Recently issued accounting standards Recently issued accounting standards (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Summary Of Significant Accounting Policies [Line Items] |  |
Debt Issuance Costs, Net | $ 10,046 | $ 6,742
Prepaid expenses and other current assets | Accounting Standards Update 2015-03 [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Debt Issuance Costs, Net |  | (2,600)
Other current liabilities | Accounting Standards Update 2015-03 [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Debt Issuance Costs, Net |  | 2,600
Other Assets | Accounting Standards Update 2015-03 [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Debt Issuance Costs, Net |  | (4,200)
Long-term Debt | Accounting Standards Update 2015-03 [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Debt Issuance Costs, Net |  | $ 4,200

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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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