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Fair Value Measurements (Fair Value Balance Sheet Long-Term Debt Grouping) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt, Gross | $ 3,563,931 | $ 3,121,558
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, net | 3,511,594 | 3,075,880
Estimate of Fair Value Measurement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 3,601,205 | 3,234,432
Parent |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt, Gross | 3,563,931 | 3,121,558
Long-term debt, net | 3,511,594 | 3,075,880
Bank Credit Facility [Member] | Fair Value, Measurements, Nonrecurring [Member] | Parent | Line of Credit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt, Gross | 1,363,477 | 1,621,054
Long-term debt, net | 1,340,958 | 1,595,703
6.875 % Senior Notes Due 2023 | Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt, Gross | 750,000 | 750,000
Long-term debt, net | 741,422 | 740,545
6.375% Senior Notes Due 2026 | Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt, Gross | 750,000 | 750,000
Long-term debt, net | 739,787 | 739,128
6.000% Senior Notes Due 2026 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt, Gross | 700,000 |
Long-term debt, net | 688,973 |
Level 1 | 6.875 % Senior Notes Due 2023 | Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt, Gross |  | 750,000
Level 1 | 6.875 % Senior Notes Due 2023 | Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes | Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, net |  | 740,545
Level 1 | 6.875 % Senior Notes Due 2023 | Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes | Estimate of Fair Value Measurement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 786,563 | 798,750
Level 1 | 6.375% Senior Notes Due 2026 | Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt, Gross |  | 750,000
Level 1 | 6.375% Senior Notes Due 2026 | Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes | Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, net |  | 739,128
Level 1 | 6.375% Senior Notes Due 2026 | Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes | Estimate of Fair Value Measurement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 756,563 | 810,000
Level 1 | 6.000% Senior Notes Due 2026 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes | Estimate of Fair Value Measurement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 691,250 |
Level 2 | Bank Credit Facility [Member] | Fair Value, Measurements, Nonrecurring [Member] | Parent | Line of Credit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt, Gross |  | 1,621,054
Level 2 | Bank Credit Facility [Member] | Fair Value, Measurements, Nonrecurring [Member] | Parent | Line of Credit | Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, net |  | 1,595,703
Level 2 | Bank Credit Facility [Member] | Fair Value, Measurements, Nonrecurring [Member] | Parent | Line of Credit | Estimate of Fair Value Measurement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt Instrument, Fair Value Disclosure | 1,366,375 | 1,625,178
Level 3 | Other Debt [Member] | Fair Value, Measurements, Nonrecurring [Member] | Parent | Other Debt Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term Debt, Gross |  | 504
Level 3 | Other Debt [Member] | Fair Value, Measurements, Nonrecurring [Member] | Parent | Other Debt Obligations [Member] | Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, net |  | 504
Level 3 | Other Debt [Member] | Fair Value, Measurements, Nonrecurring [Member] | Parent | Other Debt Obligations [Member] | Estimate of Fair Value Measurement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt Instrument, Fair Value Disclosure | $ 454 | $ 504

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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