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Condensed Statements Of Cash Flows - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Statement of Cash Flows [Abstract] |  |
Net income | $ 272,767 | $ 164,210
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 109,716 | 100,736
Loss on sale of property and equipment | 785 | 485
Share-based compensation | 2,275 | 1,590
Other operating activities, net | 39,148 | (28,507)
Net cash provided by operating activities | 424,691 | 238,514
Cash flows from investing activities: |  |
Purchase of property and equipment | (292,269) | (188,318)
Proceeds from sale of property and equipment | 528 | 7,389
Net cash used in investing activities | (291,741) | (180,929)
Cash flows from financing activities: |  |
Principal payments under long-term debt agreements | (50,000) | 0
Net payments on revolving line of credit | 0 | (9,975)
Payments for share repurchases | (47,394) | (7,135)
Dividends paid | (21,373) | (16,469)
Other financing activities, net | (1,074) | (344)
Net cash provided by (used in) financing activities | (119,841) | (33,923)
(Decrease) increase in cash and cash equivalents | 13,109 | 23,662
Cash and cash equivalents at beginning of period | 127,462 | 10,171
Cash and cash equivalents at end of period | $ 140,571 | $ 33,833

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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