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Basis of Presentation (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) customer | Jun. 30, 2014 USD ($) customer | Mar. 31, 2014 | Jun. 30, 2015 USD ($) customer item | Jun. 30, 2014 USD ($) customer
Customer concentration |  |  |  |  |
Revenues | $ | $ 483,545 | $ 515,291 |  | $ 876,325 | $ 985,365
Revenues. | Customer concentration | Top ten customers |  |  |  |  |
Customer concentration |  |  |  |  |
Number of top customers | 10 | 10 |  | 10 | 10
Number of calendar years in which top customers typically generate minimum specified percentage of revenue | item |  |  |  | 1 |
Minimum percentage of revenues generated by top ten customers |  |  |  | 50.00% |
Revenues | $ | $ 255,000 | $ 293,000 |  | $ 483,000 | $ 575,000
Percentage of concentration risk | 52.70% | 56.80% |  | 55.10% | 58.40%
Revenues. | Customer concentration | Large gas pipeline company |  |  |  |  |
Customer concentration |  |  |  |  |
Percentage of concentration risk | 11.50% |  | 8.80% | 12.50% | 8.20%
Revenues. | Customer concentration | TXDOT |  |  |  |  |
Customer concentration |  |  |  |  |
Percentage of concentration risk | 9.20% | 9.00% |  | 10.00% | 9.20%
Revenues. | Customer concentration | One customer |  |  |  |  |
Customer concentration |  |  |  |  |
Percentage of concentration risk |  |  |  | 7.00% | 8.00%
Accounts receivable | Customer concentration | One customer |  |  |  |  |
Customer concentration |  |  |  |  |
Percentage of concentration risk |  |  |  | 8.20% | 15.20%
Number of customers |  |  |  | 1 | 1
Accounts receivable | Customer concentration | Disputed Receivables |  |  |  |  |
Customer concentration |  |  |  |  |
Percentage of concentration risk |  |  |  | 15.80% | 16.50%

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