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Stock-Based Compensation - Restricted Stock, Restricted Stock Units, and Performance Units Activity (Narratives) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Stock-Based Compensation |  |  |
Additional paid-in capital | $ 3,182,247 | $ 3,182,247 | $ 3,177,982
Reclassification |  |  |
Stock-Based Compensation |  |  |
Additional paid-in capital | (200) | (200) |
Other current liabilities | $ 200 | $ 200 |
Performance units |  |  |
Stock-Based Compensation |  |  |
Converted (in shares) | 99,631 |  |
Cash settled restricted stock units and cash settled performance units |  |  |
Stock-Based Compensation |  |  |
Non-vested awards at the end of the period (in shares) | 451,000 | 451,000 |
Restricted stock shares, restricted stock units and performance units |  |  |
Stock-Based Compensation |  |  |
Non-vested awards at the end of the period (in shares) | 2,105,000 | 2,105,000 |
Restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units |  |  |
Stock-Based Compensation |  |  |
Non-vested awards at the end of the period (in shares) | 2,556,000 | 2,556,000 | 1,728,000
Unrecognized compensation |  |  |
Expected unrecognized compensation cost related to unvested awards (in dollars) | $ 18,500 | $ 18,500 |
Weighted-average period over which the expected unrecognized compensation cost related to unvested stock options will be recognized |  | 2 years 2 months 12 days |

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Converted in Period + References No definition available. + Details
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- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6904-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6911-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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