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Income Taxes (Provision For Income Taxes/(Benefit)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Components Of Income Tax Expense Benefit Continuing Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current taxes: Federal |  |  |  |  |  |  |  |  | $ 7,927 | $ 43,962 | $ 100,262
Current taxes: State |  |  |  |  |  |  |  |  | 5,818 | 9,672 | 21,835
Current taxes: Foreign |  |  |  |  |  |  |  |  | 1,255 | 1,329 | (1,831)
Current taxes: Total |  |  |  |  |  |  |  |  | 15,000 | 54,963 | 120,266
Deferred taxes: Federal |  |  |  |  |  |  |  |  | 39,127 | (9,396) | (275)
Deferred taxes: State |  |  |  |  |  |  |  |  | 6,261 | 3,056 | (8,064)
Deferred taxes: Foreign |  |  |  |  |  |  |  |  | 674 | 608 | (263)
Deferred Income Tax Expense (Benefit), Total |  |  |  |  |  |  |  |  | 46,062 | (5,732) | (8,602)
Provision for income taxes | $ 28,014 | $ 10,168 | $ 6,022 | $ 16,858 | $ (90) | $ 5,169 | $ 17,183 | $ 26,969 | $ 61,062 | $ 49,231 | $ 111,664

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- Definition Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 + Details
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