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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Data [Abstract] |
Summary Of Quarterly Financial Data |
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﻿ |  |  |  |  | 2018
﻿ |  |  |  |  | March 31 |  | June 30 |  | September 30 |  | December 31
﻿Revenue |  |  |  |  | $ | 1,148,397 |  | $ | 1,266,520 |  | $ | 1,225,007 |  | $ | 1,225,061
﻿Operating income |  |  |  |  | $ | 92,808 |  | $ | 67,957 |  | $ | 57,991 |  | $ | 39,612
﻿Net income |  |  |  |  | $ | 59,446 |  | $ | 46,884 |  | $ | 38,204 |  | $ | 32,019
﻿Basic earnings per share |  |  |  |  | $ | 2.13 |  | $ | 1.69 |  | $ | 1.37 |  | $ | 1.15
﻿Diluted earnings per share |  |  |  |  | $ | 2.13 |  | $ | 1.68 |  | $ | 1.36 |  | $ | 1.15
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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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- 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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