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Equity and Long-Term Incentive Compensation Plans - Cash Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 01, 2017 | Nov. 01, 2017 | Dec. 09, 2014 | Nov. 19, 2014 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2014 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2017
Dividends Payable |  |  |  |  |  |  |  |  |  |
Cash dividends declared (in dollars per share) |  |  |  |  | $ 0.59 | $ 0.54 |  | $ 1.18 | $ 1.06 |
Payment of dividends |  |  |  |  |  |  |  | $ 192,902 | $ 173,842 |
Dividends payable |  |  |  |  | $ 7,590 | $ 12,763 |  | 7,590 | 12,763 |
Restricted stock unit, Performance-based and Service-based |  |  |  |  |  |  |  |  |  |
Dividends Payable |  |  |  |  |  |  |  |  |  |
Dividends payable |  |  |  |  | 7,600 |  |  | 7,600 |  |
Regular cash dividend |  |  |  |  |  |  |  |  |  |
Dividends Payable |  |  |  |  |  |  |  |  |  |
Cash dividends declared (in dollars per share) |  | $ 0.59 |  |  |  |  |  |  |  |
Cash dividends paid per share (in dollars per share) | $ 0.59 |  |  |  |  |  |  |  |  |
Regular cash dividend | Restricted stock unit, Performance-based and Service-based |  |  |  |  |  |  |  |  |  |
Dividends Payable |  |  |  |  |  |  |  |  |  |
Dividends payable |  |  |  |  | 4,800 |  |  | 4,800 |  | $ 4,800
Regular cash dividend | Additional paid-in capital |  |  |  |  |  |  |  |  |  |
Dividends Payable |  |  |  |  |  |  |  |  |  |
Payment of dividends |  |  |  |  | 92,600 | $ 84,500 |  | 186,700 | 166,100 |
Special cash dividend |  |  |  |  |  |  |  |  |  |
Dividends Payable |  |  |  |  |  |  |  |  |  |
Cash dividends declared (in dollars per share) |  |  |  | $ 16.50 |  |  |  |  |  |
Cash dividends paid per share (in dollars per share) |  |  | $ 16.50 |  |  |  |  |  |  |
Cash dividends paid |  |  |  |  |  |  | $ 2,760,000 |  |  |
Special cash dividend | Restricted stock unit, Performance-based and Service-based |  |  |  |  |  |  |  |  |  |
Dividends Payable |  |  |  |  |  |  |  |  |  |
Dividends payable |  |  |  |  | $ 2,800 |  | $ 43,000 | 2,800 |  | $ 9,000
Cash dividends paid |  |  |  |  |  |  |  | $ 6,200 | $ 7,700 |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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