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Debt (Schedule Of Obligations Under Debt Arrangements) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Sep. 30, 2015 | Jul. 23, 2015 | Dec. 31, 2014 | May. 15, 2014 | Feb. 08, 2013 | Feb. 01, 2012
--- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior secured credit facility |  | $ 1,115,000 |  |  | $ 550,400 |  |  |  |
Unamortized Debt Issuance Expense and Discounts (Premiums) |  | 42,946 |  |  | 19,111 |  |  |  |
SENIOR UNSECURED NOTES, net of debt issuance costs |  | 1,807,054 |  |  | 1,030,889 |  |  |  |
Long-term debt, Face Values |  | 2,965,000 |  |  | 1,600,400 |  |  |  |
Total long-term debt |  | 2,922,054 |  |  | 1,581,289 |  |  |  |
Unamortized premium |  | 0 |  |  | 639 |  |  |  |
Seven Point Eight Seventy Five Percentage Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense and Discounts (Premiums) |  | 0 |  |  | 4,502 | [1] |  |  |
SENIOR UNSECURED NOTES, net of debt issuance costs |  | 0 |  |  | 345,498 |  |  |  |
Debt Instrument, Face Amount |  | 0 |  |  | 350,000 |  |  |  | $ 100,000
Six Percentage Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense and Discounts (Premiums) |  | 7,825 |  |  | 0 |  |  |  |
SENIOR UNSECURED NOTES, net of debt issuance costs |  | 392,175 | $ 400,000 |  | 0 |  |  |  |
Debt Instrument, Face Amount |  | 400,000 |  |  | 0 |  |  |  |
Five Point Seventy Five Percentage Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense and Discounts (Premiums) | [2] | 5,183 |  |  | 6,202 |  |  |  |
SENIOR UNSECURED NOTES, net of debt issuance costs |  | 344,817 |  |  | 343,798 |  |  |  |
Debt Instrument, Face Amount |  | 350,000 |  |  | 350,000 |  |  | $ 350,000 |
Five Point Six Two Five Percentage Senior Unsecured Notes [Member] [Domain] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense and Discounts (Premiums) |  | 7,510 |  |  | 8,407 |  |  |  |
SENIOR UNSECURED NOTES, net of debt issuance costs |  | 342,490 |  |  | 341,593 |  |  |  |
Debt Instrument, Face Amount |  | 350,000 |  |  | 350,000 |  | $ 350,000 |  |
Six Point Seven Five Percentage Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense and Discounts (Premiums) |  | 22,428 |  |  | 0 |  |  |  |
SENIOR UNSECURED NOTES, net of debt issuance costs |  | 727,572 |  |  | 0 |  |  |  |
Debt Instrument, Face Amount |  | 750,000 |  | $ 750,000 | 0 |  |  |  |
Credit Facility [Domain] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense and Discounts (Premiums) |  | $ 0 |  |  | $ 0 |  |  |  |
[1] | (2)Net of unamortized premium of $639 in 2014.
[2] | (1)In April 2015, the FASB issued guidance that requires the presentation of debt issuance costs in financial statements as a direct reduction of related debt liabilities with amortization of debt issuance costs reported as interest expense. Under current U.S. GAAP standards, debt issuance costs are reported as deferred charges (i.e., as an asset). This guidance is effective for annual periods, and interim periods within those fiscal years, beginning after December 15, 2015 and is to be applied retrospectively upon adoption. Early adoption is permitted, including adoption in an interim period for financial statements that have not been previously issued. Genesis adopted this guidance in the fourth quarter of 2015.

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