Remaining Performance Obligations	12 Months Ended
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Remaining Performance Obligations	Remaining Performance Obligations Remaining performance obligations represent the transaction price of firm orders for which work has not been performed and exclude unexercised contract options. The Company’s remaining performance obligations includes projects that have a written award, a letter of intent, a notice to proceed or an agreed upon work order to perform work on mutually accepted terms and conditions. As of December 31, 2019, the aggregate amount of the transaction prices allocated to the remaining performance obligations of the Company's Construction and Service segment contracts were $504.2 million and $41.9 million, respectively. We estimate that 68% and 96% of our Construction and Service segment remaining performance obligations as of December 31, 2019, respectively, will be recognized as revenue during 2020, with the substantial majority of remaining performance obligations to be recognized within 24 months, although the timing of the Company’s performance is not always under its control. Additionally, the difference between remaining performance obligations and backlog is due to the exclusion of a portion of the Company’s service agreements under certain contract types from the Company’s remaining performance obligations as these contracts can be canceled for convenience at any time by the Company or the customer without considerable cost incurred by the customer. Additional information related to backlog is provided in “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations” of this Annual Report on Form 10-K.

Remaining Performance Obligations

Remaining performance obligations represent the transaction price of firm orders for which work has not been performed and exclude unexercised contract options. The Company’s remaining performance obligations includes projects that have a written award, a letter of intent, a notice to proceed or an agreed upon work order to perform work on mutually accepted terms and conditions.

As of December 31, 2019, the aggregate amount of the transaction prices allocated to the remaining performance obligations of the Company's Construction and Service segment contracts were $504.2 million and $41.9 million, respectively.

We estimate that 68% and 96% of our Construction and Service segment remaining performance obligations as of December 31, 2019, respectively, will be recognized as revenue during 2020, with the substantial majority of remaining performance obligations to be recognized within 24 months, although the timing of the Company’s performance is not always under its control.

Additionally, the difference between remaining performance obligations and backlog is due to the exclusion of a portion of the Company’s service agreements under certain contract types from the Company’s remaining performance obligations as these contracts can be canceled for convenience at any time by the Company or the customer without considerable cost incurred by the customer. Additional information related to backlog is provided in “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations” of this Annual Report on Form 10-K.