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Business Segments (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Principal Geographical Areas Information |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,099,291 | $ 1,030,388 | $ 1,053,065 | $ 992,928 | $ 1,114,198 | $ 1,099,393 | $ 985,346 | $ 912,534 | $ 4,175,672 | $ 4,111,471 | $ 3,716,317
Income (loss) from construction operations | 70,175 | 58,094 | 39,474 | 36,079 | 60,724 | 54,676 | (354,174) | 16,963 | 203,822 | (221,811) | 168,376
Assets | 3,397,438 |  |  |  | 3,296,410 |  |  |  | 3,397,438 | 3,296,410 | 3,613,127
Corporate |  |  |  |  |  |  |  |  |  |  |
Principal Geographical Areas Information |  |  |  |  |  |  |  |  |  |  |
Income (loss) from construction operations |  |  |  |  |  |  |  |  | (47,432) | (45,094) | (44,336)
Assets | 576,127 |  |  |  | 727,699 |  |  |  | 576,127 | 727,699 | 604,455
United States | Reportable Geographical Components |  |  |  |  |  |  |  |  |  |  |
Principal Geographical Areas Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 4,000,380 | 3,925,733 | 3,508,349
Income (loss) from construction operations |  |  |  |  |  |  |  |  | 238,989 | (195,457) | 184,268
Assets | 3,182,706 |  |  |  | 3,107,808 |  |  |  | 3,182,706 | 3,107,808 | 3,460,470
Foreign and U.S. Territories | Reportable Geographical Components |  |  |  |  |  |  |  |  |  |  |
Principal Geographical Areas Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 175,292 | 185,738 | 207,968
Income (loss) from construction operations |  |  |  |  |  |  |  |  | 12,265 | 18,740 | 28,444
Assets | $ 214,732 |  |  |  | $ 188,602 |  |  |  | $ 214,732 | $ 188,602 | $ 152,657

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