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Fair Value Measurements and Derivative Instruments (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Level 1 |  |  |
Assets: |  |  |
Cash and cash equivalents | [1],[2] | $ 111,245 | $ 120,112
Total Assets | [2] | 111,245 | 120,112
Liabilities: |  |  |
Long-term debt (including current portion of long-term debt) | [2],[3] | 0 | 0
Total Liabilities | [2] | 0 | 0
Level 2 |  |  |
Assets: |  |  |
Cash and cash equivalents | [1],[4] | 0 | 0
Total Assets | [4] | 0 | 0
Liabilities: |  |  |
Long-term debt (including current portion of long-term debt) | [3],[4] | 9,333,745 | 8,038,092
Total Liabilities | [4] | 9,333,745 | 8,038,092
Level 3 |  |  |
Assets: |  |  |
Cash and cash equivalents | [1],[5] | 0 | 0
Total Assets | [5] | 0 | 0
Liabilities: |  |  |
Long-term debt (including current portion of long-term debt) | [3],[5] | 0 | 0
Total Liabilities | [5] | 0 | 0
Total Carrying Amount |  |  |
Assets: |  |  |
Cash and cash equivalents | [1] | 111,245 | 120,112
Total Assets |  | 111,245 | 120,112
Liabilities: |  |  |
Long-term debt (including current portion of long-term debt) | [3] | 8,762,052 | 7,506,312
Total Liabilities |  | 8,762,052 | 7,506,312
Total Fair Value |  |  |
Assets: |  |  |
Cash and cash equivalents | [1] | 111,245 | 120,112
Total Assets |  | 111,245 | 120,112
Liabilities: |  |  |
Long-term debt (including current portion of long-term debt) | [3] | 9,333,745 | 8,038,092
Total Liabilities |  | $ 9,333,745 | $ 8,038,092
[1] | Consists of cash and marketable securities with original maturities of less than 90 days.
[2] | Inputs based on quoted prices (unadjusted) in active markets for identical assets or liabilities that we have the ability to access. Valuation of these items does not entail a significant amount of judgment.
[3] | Consists of unsecured revolving credit facilities, senior notes, senior debentures and term loans. This does not include our capital lease obligations.
[4] | Inputs other than quoted prices included within Level 1 that are observable for the liability, either directly or indirectly. For unsecured revolving credit facilities and unsecured term loans, fair value is determined utilizing the income valuation approach. This valuation model takes into account the contract terms of our debt such as the debt maturity and the interest rate on the debt. The valuation model also takes into account the creditworthiness of the Company.
[5] | Inputs that are unobservable. The Company did not use any Level 3 inputs as of March 31, 2018 and December 31, 2017.

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 + Details
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