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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Data [Abstract] |
Summary Of Quarterly Financial Data |
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﻿ |  |  |  |  | 2017
﻿ |  |  |  |  | March 31 |  | June 30 |  | September 30 |  | December 31
﻿Revenue |  |  |  |  | $ | 1,068,829 |  | $ | 1,169,409 |  | $ | 1,128,074 |  | $ | 1,110,100
﻿Operating income |  |  |  |  | $ | 73,173 |  | $ | 106,725 |  | $ | 30,867 |  | $ | 60,029
﻿Net income |  |  |  |  | $ | 46,120 |  | $ | 66,730 |  | $ | 19,610 |  | $ | 43,793
﻿Basic earnings per share |  |  |  |  | $ | 1.60 |  | $ | 2.33 |  | $ | 0.69 |  | $ | 1.56
﻿Diluted earnings per share |  |  |  |  | $ | 1.60 |  | $ | 2.32 |  | $ | 0.69 |  | $ | 1.55
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﻿ |  |  |  |  | 2016
﻿ |  |  |  |  | March 31 |  | June 30 |  | September 30 |  | December 31
﻿Revenue |  |  |  |  | $ | 834,459 |  | $ | 998,383 |  | $ | 1,036,982 |  | $ | 1,034,560
﻿Operating income (loss) |  |  |  |  | $ | (46,604) |  | $ | 40,895 |  | $ | 9,726 |  | $ | 30,550
﻿Net income (loss) |  |  |  |  | $ | (26,432) |  | $ | 25,596 |  | $ | 7,799 |  | $ | 15,975
﻿Basic earnings (loss) per share |  |  |  |  | $ | (0.88) |  | $ | 0.88 |  | $ | 0.27 |  | $ | 0.55
﻿Diluted earnings (loss) per share |  |  |  |  | $ | (0.88) |  | $ | 0.87 |  | $ | 0.27 |  | $ | 0.55
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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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