Commitments and Contingencies	12 Months Ended
Dec. 31, 2011
Notes to Financial Statements [Abstract]
Commitments and Contingencies	Note 8 - Commitments and Contingencies Questar and each of its subsidiaries are involved in various commercial and regulatory claims and litigation and other legal proceedings that arise in the ordinary course of its business. Management does not believe any of them individually or in the aggregate will have a material adverse effect on Questar's, Questar Pipeline's or Questar Gas's financial position, results of operations or cash flows. A liability is recorded for a loss contingency when its occurrence is probable and damages can be reasonably estimated based on the anticipated most likely outcome. Disclosures are provided for contingencies reasonably likely to occur, which would have a material adverse effect on Questar's, Questar Pipeline's or Questar Gas's financial position, results of operations or cash flows. Some of the claims involve highly complex issues relating to liability, damages and other matters subject to substantial uncertainties and, therefore, the probability of liability or an estimate of loss cannot be reasonably determined. No registrant currently has any such claims. Commitments The Company is committed to lease its headquarters building through April 30, 2012. Minimum future payments under the terms of this long-term operating lease total $3.4 million in 2012. Rental expense amounted to $3.2 million in 2011, $3.4 million in 2010 and $3.5 million in 2009. In June 2010, Questar entered into a lease agreement for a new headquarters building that is being constructed. The lease term is 17 years beginning in May 2012. Initial lease payments are $3.2 million per year. Questar expects to account for this lease as a capital lease. Wexpro Wexpro has a $2.8 million drilling rig contract commitment in 2012. Questar Gas Historically, 40% to 50% of Questar Gas gas supply has been provided by cost-of-service reserves developed and produced by Wexpro. In 2011, Questar Gas purchased the remainder of its gas supply from multiple third parties under index-based or fixed-price contracts. Questar Gas has commitments to purchase gas for $36.2 million in 2012, $15.2 million in each of 2013 through 2015, and $15.3 million in 2016 based on current prices. Generally, at the conclusion of the heating season and after a bid process, new agreements for the next heating season are put in place. Questar Gas bought natural gas under purchase agreements amounting to $221.0 million in 2011, $245.2 million in 2010 and $225.3 million in 2009. In addition, Questar Gas stores gas during off-peak periods (typically during the summer) and withdraws gas from storage to meet peak-gas demand (typically in the winter). The company has contracted for transportation and underground storage services with Questar Pipeline. Annual payments for these services amount to $69.9 million in 2012, $68.0 million in 2013, and $64.5 million in 2014 through 2016. Questar Gas has third-party transportation commitments requiring yearly payments of $28.8 million in 2012 through 2016.

Note 8 - Commitments and Contingencies

Questar and each of its subsidiaries are involved in various commercial and regulatory claims and litigation and other legal proceedings that arise in the ordinary course of its business. Management does not believe any of them individually or in the aggregate will have a material adverse effect on Questar's, Questar Pipeline's or Questar Gas's financial position, results of operations or cash flows.

A liability is recorded for a loss contingency when its occurrence is probable and damages can be reasonably estimated based on the anticipated most likely outcome. Disclosures are provided for contingencies reasonably likely to occur, which would have a material adverse effect on Questar's, Questar Pipeline's or Questar Gas's financial position, results of operations or cash flows. Some of the claims involve highly complex issues relating to liability, damages and other matters subject to substantial uncertainties and, therefore, the probability of liability or an estimate of loss cannot be reasonably determined. No registrant currently has any such claims.

Commitments

The Company is committed to lease its headquarters building through April 30, 2012. Minimum future payments under the terms of this long-term operating lease total $3.4 million in 2012. Rental expense amounted to $3.2 million in 2011, $3.4 million in 2010 and $3.5 million in 2009.

In June 2010, Questar entered into a lease agreement for a new headquarters building that is being constructed. The lease term is 17 years beginning in May 2012. Initial lease payments are $3.2 million per year. Questar expects to account for this lease as a capital lease.

Wexpro

Wexpro has a $2.8 million drilling rig contract commitment in 2012.

Questar Gas

Historically, 40% to 50% of Questar Gas gas supply has been provided by cost-of-service reserves developed and produced by Wexpro. In 2011, Questar Gas purchased the remainder of its gas supply from multiple third parties under index-based or fixed-price contracts. Questar Gas has commitments to purchase gas for $36.2 million in 2012, $15.2 million in each of 2013 through 2015, and $15.3 million in 2016 based on current prices. Generally, at the conclusion of the heating season and after a bid process, new agreements for the next heating season are put in place. Questar Gas bought natural gas under purchase agreements amounting to $221.0 million in 2011, $245.2 million in 2010 and $225.3 million in 2009.

In addition, Questar Gas stores gas during off-peak periods (typically during the summer) and withdraws gas from storage to meet peak-gas demand (typically in the winter). The company has contracted for transportation and underground storage services with Questar Pipeline. Annual payments for these services amount to $69.9 million in 2012, $68.0 million in 2013, and $64.5 million in 2014 through 2016. Questar Gas has third-party transportation commitments requiring yearly payments of $28.8 million in 2012 through 2016.