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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2013 item | Dec. 31, 2012 item
Commitments and Contingencies |  |
Irrevocable standby letters of credit outstanding | $ 19.7 | $ 19.7
Number of letters of credit related to the payment obligation under insurance programs | 1 | 1
Letters of credit outstanding related to the payment obligation under insurance programs | 17.5 | 17.5
Letters of credit outstanding related to contract performance obligations | 2.2 | 2.2
Future minimum lease payments for operating leases |  |
Remainder of 2013 | 1.3 |
2014 | 1.3 |
2015 | 0.6 |
2016 | 0.3 |
2017 | 0.2 |
Thereafter | 0.4 |
Purchase Commitments for Construction Equipment |  |
Outstanding purchase orders for certain construction equipment | $ 1.8 |
Scheduled period of time for cash outlay requirements | 4 months |
Minimum |  |
Leases |  |
Term of operating lease | 1 year |
Maximum |  |
Leases |  |
Term of operating lease | 9 years |

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