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Business Segments (Principal Geographical Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Principal Geographical Areas Information |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 1,200,830 | $ 1,340,739 | $ 1,312,438 | $ 1,066,465 | $ 1,201,877 | $ 1,250,689 | $ 1,084,510 | $ 955,233 | $ 4,920,472 | $ 4,492,309 | $ 4,175,672
Income (loss) from construction operations |  | 15,474 | $ 38,974 | $ 30,881 | $ 20,084 | 64,396 | $ 70,354 | $ 65,443 | $ 41,497 | 105,413 | 241,690 | 203,822
Assets |  | 4,042,441 |  |  |  | 3,773,315 |  |  |  | 4,042,441 | 3,773,315 |
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |
Principal Geographical Areas Information |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from construction operations |  |  |  |  |  |  |  |  |  | (54,242) | (54,559) | (47,432)
Assets | [1] | 416,503 |  |  |  | 503,050 |  |  |  | 416,503 | 503,050 |
United States [Member] |  |  |  |  |  |  |  |  |  |  |  |
Principal Geographical Areas Information |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 4,694,165 | 4,323,471 | 4,000,380
Income (loss) from construction operations |  |  |  |  |  |  |  |  |  | 128,869 | 268,566 | 238,989
Assets |  | 3,868,449 |  |  |  | 3,612,997 |  |  |  | 3,868,449 | 3,612,997 |
Foreign and U.S. Territories [Member] |  |  |  |  |  |  |  |  |  |  |  |
Principal Geographical Areas Information |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 226,307 | 168,838 | 175,292
Income (loss) from construction operations |  |  |  |  |  |  |  |  |  | 30,786 | 27,683 | $ 12,265
Assets |  | $ 173,992 |  |  |  | $ 160,318 |  |  |  | $ 173,992 | $ 160,318 |
[1] | Consists principally of cash and cash equivalents and corporate transportation equipment.

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