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Long-Term Debt (Tables) | 3 Months Ended
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Mar. 31, 2019
Debt Disclosure [Abstract] |
Schedule of Credit Agreement Facilities [Table Text Block] | The following table presents the outstanding balance, total amount of letters of credit outstanding, and available borrowing capacity under the Credit Agreement as of April 25, 2019, March 31, 2019, and December 31, 2018:
| As of April 25, 2019 |  | As of March 31, 2019 |  | As of December 31, 2018
| (in thousands)
Credit facility balance (1) | $ | 40,000 |  |  | $ | 46,500 |  |  | $ | — |
Letters of credit (2) | — |  |  | — |  |  | 200 |
Available borrowing capacity | 1,160,000 |  |  | 953,500 |  |  | 999,800 |
Total aggregate lender commitment amount | $ | 1,200,000 |  |  | $ | 1,000,000 |  |  | $ | 1,000,000 |
____________________________________________
(1) | Unamortized deferred financing costs attributable to the credit facility are presented as a component of other noncurrent assets on the accompanying balance sheets and totaled $6.0 million and $6.4 million as of March 31, 2019, and December 31, 2018, respectively. These costs are being amortized over the term of the credit facility on a straight-line basis.
(2) | Letters of credit outstanding reduce the amount available under the credit facility on a dollar-for-dollar basis. The letter of credit outstanding as of December 31, 2018, was released during the quarter ended March 31, 2019.
Schedule of Senior Notes [Table Text Block] | The Senior Notes, net of unamortized deferred financing costs line item on the accompanying balance sheets as of March 31, 2019, and December 31, 2018, consisted of the following:
| As of March 31, 2019 |  | As of December 31, 2018
| Principal Amount |  | Unamortized Deferred Financing Costs |  | Principal Amount, Net of Unamortized Deferred Financing Costs |  | Principal Amount |  | Unamortized Deferred Financing Costs |  | Principal Amount, Net of Unamortized Deferred Financing Costs
| (in thousands)
6.125% Senior Notes due 2022 | $ | 476,796 |  |  | $ | 3,671 |  |  | $ | 473,125 |  |  | $ | 476,796 |  |  | $ | 3,921 |  |  | $ | 472,875 |
5.0% Senior Notes due 2024 | 500,000 |  |  | 4,457 |  |  | 495,543 |  |  | 500,000 |  |  | 4,688 |  |  | 495,312 |
5.625% Senior Notes due 2025 | 500,000 |  |  | 5,582 |  |  | 494,418 |  |  | 500,000 |  |  | 5,808 |  |  | 494,192 |
6.75% Senior Notes due 2026 | 500,000 |  |  | 6,198 |  |  | 493,802 |  |  | 500,000 |  |  | 6,407 |  |  | 493,593 |
6.625% Senior Notes due 2027 | 500,000 |  |  | 7,300 |  |  | 492,700 |  |  | 500,000 |  |  | 7,533 |  |  | 492,467 |
Total | $ | 2,476,796 |  |  | $ | 27,208 |  |  | $ | 2,449,588 |  |  | $ | 2,476,796 |  |  | $ | 28,357 |  |  | $ | 2,448,439 |
Schedule of Senior Convertible Notes [Table Text Block] | The Senior Convertible Notes, net of unamortized discount and deferred financing costs line on the accompanying balance sheets as of March 31, 2019, and December 31, 2018, consisted of the following:
| As of March 31, 2019 |  | As of December 31, 2018
| (in thousands)
Principal amount of Senior Convertible Notes | $ | 172,500 |  |  | $ | 172,500 |
Unamortized debt discount | (20,238 | ) |  | (22,313 | )
Unamortized deferred financing costs | (2,063 | ) |  | (2,293 | )
Senior Convertible Notes, net of unamortized discount and deferred financing costs | $ | 150,199 |  |  | $ | 147,894 |

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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