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Commitments and Contingencies (Details Textual 1) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Loss Contingencies [Abstract] |  |  |
Letters of Credit Outstanding, Amount | $ 19.3 | $ 19.3 |
Letters Of Credit Outstanding Amount Related To Payment Obligation Under Insurance Programs | 17.5 | 17.5 |
Letters Of Credit Outstanding Amount Related To Contract Performance Obligations | 1.8 | 1.8 |
Future minimum lease payments for operating leases |  |  |
2016 | 1.7 |  |
2017 | 1.1 |  |
2018 | 0.9 |  |
2019 | 0.7 |  |
2020 | 0.1 |  |
2021 | 0.1 |  |
Operating lease, additional disclosure |  |  |
Rent expense | $ 57.2 | $ 41.1 | $ 51.2
Purchase Commitments for Construction Equipment |  |  |
Significant Purchase Commitment Scheduled Period of Time for Cash Outlay | 3 months |  |
Outstanding purchase orders for certain construction equipment | $ 2.2 |  |
Maximum [Member] |  |  |
Operating Leases [Abstract] |  |  |
Operating Lease Term | 6 years |  |
Minimum [Member] |  |  |
Operating Leases [Abstract] |  |  |
Operating Lease Term | 1 year |  |

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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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