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Fair Value Measurements and Derivative Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |  |
Cash and cash equivalents |  | $ 254,821 | $ 120,112
Fair Value, Measurements, Nonrecurring | Level 1 |  |  |
Assets: |  |  |
Total Assets | [1] | 254,821 | 120,112
Liabilities: |  |  |
Long-term debt (including current portion of long-term debt) | [1],[2] | 0 | 0
Total Liabilities | [1] | 0 | 0
Fair Value, Measurements, Nonrecurring | Level 2 |  |  |
Assets: |  |  |
Cash and cash equivalents | [3],[4] | 0 | 0
Total Assets | [4] | 0 | 0
Liabilities: |  |  |
Long-term debt (including current portion of long-term debt) | [2],[4] | 9,495,498 | 8,038,092
Total Liabilities | [4] | 9,495,498 | 8,038,092
Fair Value, Measurements, Nonrecurring | Level 3 |  |  |
Assets: |  |  |
Cash and cash equivalents | [3],[5] | 0 | 0
Total Assets | [5] | 0 | 0
Liabilities: |  |  |
Long-term debt (including current portion of long-term debt) | [2],[5] | 0 | 0
Total Liabilities | [5] | 0 | 0
Fair Value, Measurements, Nonrecurring | Total Carrying Amount |  |  |
Assets: |  |  |
Cash and cash equivalents | [3] | 254,821 |
Cash and cash equivalents | [3] |  | 120,112
Total Assets |  | 254,821 | 120,112
Liabilities: |  |  |
Long-term debt (including current portion of long-term debt) | [2] | 9,041,183 | 7,506,312
Total Liabilities |  | 9,041,183 | 7,506,312
Fair Value, Measurements, Nonrecurring | Total Carrying Amount | Level 1 |  |  |
Assets: |  |  |
Cash and cash equivalents | [1],[3] | 254,821 | 120,112
Fair Value, Measurements, Nonrecurring | Total Fair Value |  |  |
Assets: |  |  |
Cash and cash equivalents | [3] | 254,821 | 120,112
Total Assets |  | 254,821 | 120,112
Liabilities: |  |  |
Long-term debt (including current portion of long-term debt) | [2] | 9,495,498 | 8,038,092
Total Liabilities |  | $ 9,495,498 | $ 8,038,092
[1] | 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.
[2] | Consists of unsecured revolving credit facilities, senior notes, senior debentures and term loans. These amounts do not include our capital lease obligations or commercial paper.
[3] | Consists of cash and marketable securities with original maturities of less than 90 days.
[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 September 30, 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition For the entity and the disposal group, cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. + References No definition available. + 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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