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Revenue (Tables) | 6 Months Ended
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Jun. 30, 2018
Revenue [Abstract] |
Disaggregation Of Revenue | Disaggregation of Revenue ﻿ The following tables disaggregate revenue by end market, customer type and contract type, which the Company believes best depicts how the nature, amount, timing and uncertainty of its revenue and cash flows are affected by economic factors. ﻿ ﻿
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﻿ |  | Three Months |  | Six Months
﻿ |  | Ended June 30, |  | Ended June 30,
﻿(in thousands) |  | 2018 |  | 2018
﻿Civil segment revenue by end market: |  |  |  |  |  |
﻿Mass transit |  | $ | 158,096 |  | $ | 308,222
﻿Bridges |  |  | 120,929 |  |  | 183,739
﻿Highways |  |  | 65,809 |  |  | 83,066
﻿Tunneling |  |  | 23,931 |  |  | 32,632
﻿Other |  |  | 33,708 |  |  | 57,928
﻿Total Civil segment revenue |  | $ | 402,473 |  | $ | 665,587
﻿ ﻿
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﻿ |  |  |  |  |  |
﻿ |  | Three Months |  | Six Months
﻿ |  | Ended June 30, |  | Ended June 30,
﻿(in thousands) |  | 2018 |  | 2018
﻿Building segment revenue by end market: |  |  |  |  |  |
﻿Health care facilities |  | $ | 118,116 |  | $ | 193,197
﻿Office |  |  | 39,237 |  |  | 186,559
﻿Hospitality and gaming |  |  | 79,490 |  |  | 161,255
﻿Municipal and government |  |  | 70,528 |  |  | 120,981
﻿Mixed use |  |  | 38,814 |  |  | 80,590
﻿Education facilities |  |  | 32,876 |  |  | 65,358
﻿Industrial and commercial |  |  | 20,081 |  |  | 46,507
﻿Other |  |  | 47,837 |  |  | 82,773
﻿Total Building segment revenue |  | $ | 446,979 |  | $ | 937,220
﻿ ﻿
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﻿ |  | Three Months |  | Six Months
﻿ |  | Ended June 30, |  | Ended June 30,
﻿(in thousands) |  | 2018 |  | 2018
﻿Specialty Contractors segment revenue by end market: |  |  |  |  |  |
﻿Mass transit |  | $ | 78,169 |  | $ | 153,351
﻿Mixed use |  |  | 51,976 |  |  | 99,833
﻿Industrial and commercial |  |  | 36,540 |  |  | 75,878
﻿Transportation |  |  | 22,019 |  |  | 56,004
﻿Education facilities |  |  | 26,298 |  |  | 51,602
﻿Condominiums |  |  | 22,761 |  |  | 45,850
﻿Health care facilities |  |  | 14,623 |  |  | 30,988
﻿Other |  |  | 18,247 |  |  | 31,928
﻿Total Specialty Contractors segment revenue |  | $ | 270,633 |  | $ | 545,434
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﻿ |  | Three Months Ended June 30, 2018
﻿ |  |  |  |  |  |  |  | Specialty |  |  |
﻿(in thousands) |  | Civil |  | Building |  | Contractors |  | Total
﻿Revenue by customer type: |  |  |  |  |  |  |  |  |  |  |  |
﻿State and local agencies |  | $ | 327,195 |  | $ | 159,556 |  | $ | 106,308 |  | $ | 593,059
﻿Federal agencies |  |  | 30,772 |  |  | 52,263 |  |  | 14,988 |  |  | 98,023
﻿Private owners |  |  | 44,506 |  |  | 235,160 |  |  | 149,337 |  |  | 429,003
﻿Total revenue |  | $ | 402,473 |  | $ | 446,979 |  | $ | 270,633 |  | $ | 1,120,085
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﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Six Months Ended June 30, 2018
﻿ |  |  |  |  |  |  |  | Specialty |  |  |
﻿(in thousands) |  | Civil |  | Building |  | Contractors |  | Total
﻿Revenue by customer type: |  |  |  |  |  |  |  |  |  |  |  |
﻿State and local agencies |  | $ | 553,546 |  | $ | 275,541 |  | $ | 212,628 |  | $ | 1,041,715
﻿Federal agencies |  |  | 40,627 |  |  | 96,574 |  |  | 33,712 |  |  | 170,913
﻿Private owners |  |  | 71,414 |  |  | 565,105 |  |  | 299,094 |  |  | 935,613
﻿Total revenue |  | $ | 665,587 |  | $ | 937,220 |  | $ | 545,434 |  | $ | 2,148,241
﻿ State and local agencies. The Company’s state and local government customers include state transportation departments, metropolitan authorities, cities, municipal agencies, school districts and public universities. Services provided to state and local customers are primarily pursuant to contracts awarded through competitive bidding processes. Construction services for state and local government customers have included mass-transit systems, bridges, highways, judicial and correctional facilities, schools and dormitories, health care facilities, convention centers, parking structures and other municipal buildings. The vast majority of the Company’s civil contracting and building construction services are provided in locations throughout the United States and its territories. ﻿ Federal agencies. The Company’s federal government customers include the U.S. State Department, the U.S. Navy, the U.S. Army Corps of Engineers, the U.S. Air Force and the National Park Service. Services provided to federal agencies are typically pursuant to competitively bid contracts for specific or multi-year assignments that involve new construction or infrastructure repairs or improvements. A portion of revenue from federal agencies is derived from projects in overseas locations. ﻿ Private owners. The Company’s private customers include real estate developers, health care companies, technology companies, hospitality and gaming resort owners, Native American sovereign nations, public corporations and private universities. Services are provided to private customers through negotiated contract arrangements, as well as through competitive bids. ﻿ Most federal, state and local government contracts contain provisions that permit the termination of contracts, in whole or in part, for the convenience of the government, among other reasons. ﻿ ﻿
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﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Three Months Ended June 30, 2018
﻿ |  |  |  |  |  |  |  | Specialty |  |  |
﻿(in thousands) |  | Civil |  | Building |  | Contractors |  | Total
﻿Revenue by contract type: |  |  |  |  |  |  |  |  |  |  |  |
﻿Fixed price |  | $ | 259,927 |  | $ | 96,657 |  | $ | 234,495 |  | $ | 591,079
﻿Guaranteed maximum price |  |  | 3,103 |  |  | 270,440 |  |  | 17,462 |  |  | 291,005
﻿Unit price |  |  | 121,447 |  |  | 10,771 |  |  | 7,233 |  |  | 139,451
﻿Cost plus fee and other |  |  | 17,996 |  |  | 69,111 |  |  | 11,443 |  |  | 98,550
﻿Total revenue |  | $ | 402,473 |  | $ | 446,979 |  | $ | 270,633 |  | $ | 1,120,085
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﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Six Months Ended June 30, 2018
﻿ |  |  |  |  |  |  |  | Specialty |  |  |
﻿(in thousands) |  | Civil |  | Building |  | Contractors |  | Total
﻿Revenue by contract type: |  |  |  |  |  |  |  |  |  |  |  |
﻿Fixed price |  | $ | 443,830 |  | $ | 175,658 |  | $ | 481,919 |  | $ | 1,101,407
﻿Guaranteed maximum price |  |  | 8,175 |  |  | 532,468 |  |  | 33,042 |  |  | 573,685
﻿Unit price |  |  | 190,201 |  |  | 19,588 |  |  | 13,890 |  |  | 223,679
﻿Cost plus fee and other |  |  | 23,381 |  |  | 209,506 |  |  | 16,583 |  |  | 249,470
﻿Total revenue |  | $ | 665,587 |  | $ | 937,220 |  | $ | 545,434 |  | $ | 2,148,241
﻿ Fixed price. Fixed price or lump sum contracts are most commonly used for projects in the Civil and Specialty Contractors segments and generally commit the Company to provide all of the resources required to complete a project for a fixed sum. Usually, fixed price contracts transfer more risk to the Company, but offer the opportunity for greater profits. Billings on fixed price contracts are typically based on estimated progress against predetermined contractual milestones. ﻿ Guaranteed maximum price (“GMP”). GMP contracts provide for a cost plus fee arrangement up to a maximum agreed upon price. These contracts place risks on the Company for amounts in excess of the GMP, but may permit an opportunity for greater profits than under cost plus fee contracts through sharing agreements with the owner on any cost savings that may be realized. Services provided by our Building segment to various private customers are often performed under GMP contracts. Billings on GMP contracts typically occur on a monthly basis and are based on actual costs incurred plus a negotiated margin. ﻿ Unit price. Unit price contracts are most prevalent for projects in the Civil and Specialty Contractors segments and generally commit the Company to provide an estimated or undetermined number of units or components that comprise a project at a fixed price per unit. This approach shifts the risk of estimating the quantity of units required to the project owner, but the risk of increased cost per unit is borne by the Company, unless otherwise allowed for in the contract. Billings on unit price contracts typically occur on a monthly basis and are based on actual quantity of work performed or completed during the billing period. ﻿ Cost plus fee. Cost plus fee contracts are used for many projects in the Building and Specialty Contractors segments. Cost plus fee contracts include cost plus fixed fee contracts and cost plus award fee contracts. Cost plus fixed fee contracts provide for reimbursement of approved project costs plus a fixed fee. Cost plus award fee contracts provide for reimbursement of the project costs plus a base fee, as well as an incentive fee based on cost and/or schedule performance. Cost plus fee contracts serve to minimize the Company’s financial risk, but may also limit profits. Billings on cost plus fee contracts typically occur on a monthly basis based on actual costs incurred plus a negotiated margin.

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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