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Long-Term Debt Senior Notes (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2017

Sep. 30, 2016

Mar. 31, 2016

Sep. 30, 2017

Sep. 30, 2016

Mar. 31, 2017

Dec. 31, 2016

Debt Instrument [Line Items]

Senior Notes, noncurrent

$ 2,768,346

$ 2,768,346

$ 2,766,719

Net gain on extinguishment of debt

$ 0

$ 0

(35)

$ 15,722

Loss on extinguishment of debt, acceleration of unamortized deferred financing costs

(22)

15,722

Proceeds from debt, net of paid and accrued fees

$ 0

166,681

6.50% Senior Notes Due 2021 [Member]

Debt Instrument [Line Items]

Senior Notes, interest rate, stated percentage

6.50%

6.50%

Senior Notes, face amount

$ 344,611

^[1]

$ 344,611

^[1]

346,955

^[2]

Unamortized deferred financing costs

(2,830)

^[1]

(2,830)

^[1]

(3,372)

^[2]

Senior Notes, noncurrent

$ 341,781

^[1]

$ 341,781

^[1]

343,583

^[2]

Senior Notes, repurchased face amount

$ 2,300

6.125% Senior Notes Due 2022 [Member]

Debt Instrument [Line Items]

Senior Notes, interest rate, stated percentage

6.125%

6.125%

Senior Notes, face amount

$ 561,796

$ 561,796

561,796

^[2]

Unamortized deferred financing costs

(6,095)

(6,095)

(6,979)

^[2]

Senior Notes, noncurrent

$ 555,701

$ 555,701

554,817

^[2]

6.50% Senior Notes Due 2023 [Member]

Debt Instrument [Line Items]

Senior Notes, interest rate, stated percentage

6.50%

6.50%

Senior Notes, face amount

$ 394,985

$ 394,985

394,985

^[2]

Unamortized deferred financing costs

(3,889)

(3,889)

(4,436)

^[2]

Senior Notes, noncurrent

$ 391,096

$ 391,096

390,549

^[2]

5% Senior Notes Due 2024 [Member]

Debt Instrument [Line Items]

Senior Notes, interest rate, stated percentage

5.00%

5.00%

Senior Notes, face amount

$ 500,000

$ 500,000

500,000

Unamortized deferred financing costs

(5,841)

(5,841)

(6,533)

Senior Notes, noncurrent

$ 494,159

$ 494,159

493,467

5.625% Senior Notes Due 2025 [Member]

Debt Instrument [Line Items]

Senior Notes, interest rate, stated percentage

5.625%

5.625%

Senior Notes, face amount

$ 500,000

$ 500,000

500,000

Unamortized deferred financing costs

(6,940)

(6,940)

(7,619)

Senior Notes, noncurrent

$ 493,060

$ 493,060

492,381

6.75% Senior Notes Due 2026 [Member]

Debt Instrument [Line Items]

Senior Notes, interest rate, stated percentage

6.75%

6.75%

Senior Notes, face amount

$ 500,000

$ 500,000

500,000

^[3]

Unamortized deferred financing costs

(7,451)

(7,451)

(8,078)

^[3]

Senior Notes, noncurrent

492,549

492,549

491,922

^[3]

Proceeds from debt, net of paid and accrued fees

491,600

Senior Notes [Member]

Debt Instrument [Line Items]

Senior Notes, face amount

2,801,392

2,801,392

2,803,736

Unamortized deferred financing costs

(33,046)

(33,046)

(37,017)

Senior Notes, noncurrent

$ 2,768,346

$ 2,768,346

$ 2,766,719

Senior Notes [Member]

Debt Instrument [Line Items]

Senior Notes, repurchased face amount

$ 46,300

Senior Notes, repurchased settlement amount

$ 29,900

Net gain on extinguishment of debt

15,700

Senior Notes, gain associated with repurchase discount

16,400

Loss on extinguishment of debt, acceleration of unamortized deferred financing costs

$ (700)

Senior Notes [Member] | 6.50% Senior Notes Due 2021 [Member]

Debt Instrument [Line Items]

Senior Notes, interest rate, stated percentage

6.50%

6.50%

Senior Notes, face amount

$ 344,611

$ 344,611

Senior Notes [Member] | 6.125% Senior Notes Due 2022 [Member]

Debt Instrument [Line Items]

Senior Notes, interest rate, stated percentage

6.125%

6.125%

Senior Notes, face amount

$ 561,796

$ 561,796

Senior Notes [Member] | 6.50% Senior Notes Due 2023 [Member]

Debt Instrument [Line Items]

Senior Notes, interest rate, stated percentage

6.50%

6.50%

Senior Notes, face amount

$ 394,985

$ 394,985

Senior Notes [Member] | 5% Senior Notes Due 2024 [Member]

Debt Instrument [Line Items]

Senior Notes, interest rate, stated percentage

5.00%

5.00%

Senior Notes, face amount

$ 500,000

$ 500,000

Senior Notes [Member] | 5.625% Senior Notes Due 2025 [Member]

Debt Instrument [Line Items]

Senior Notes, interest rate, stated percentage

5.625%

5.625%

Senior Notes, face amount

$ 500,000

$ 500,000

Senior Notes [Member] | 6.75% Senior Notes Due 2026 [Member]

Debt Instrument [Line Items]

Senior Notes, interest rate, stated percentage

6.75%

6.75%

Senior Notes, face amount

$ 500,000

$ 500,000

[1]	During the first quarter of 2017, the Company repurchased a total of $2.3 million in aggregate principal amount of 6.50% Senior Notes due 2021 in open market transactions at a slight premium. The Company canceled all of these repurchased Senior Notes upon cash settlement.
[2]	During the first quarter of 2016, the Company repurchased a total of $46.3 million in aggregate principal amount of certain of its Senior Notes in open market transactions for a settlement amount of $29.9 million, excluding interest. The Company recorded a net gain on extinguishment of debt of approximately $15.7 million for the nine months ended September 30, 2016. This amount includes a gain of approximately $16.4 million associated with the discount realized upon repurchase, which was partially offset by approximately $0.7 million related to the acceleration of unamortized deferred financing costs. The Company canceled all of these repurchased Senior Notes upon cash settlement.
[3]	On September 12, 2016, the Company issued 6.75% Senior Notes due September 15, 2026. The Company received net proceeds of $491.6 million after deducting paid and accrued fees. The net proceeds were used to partially fund the Rock Oil Acquisition that closed on October 4, 2016.

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Contractual interest rate for funds borrowed, under the debt agreement.

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