Income taxes	9 Months Ended
Sep. 30, 2014
Income Tax Disclosure [Abstract]
Income taxes	10. Income taxes At the end of each interim period, the Company applies its estimated annual effective tax rate (“ETR”) to its interim earnings before considering the tax effect of any discrete items. The Company also records the tax impact of certain unusual or infrequently occurring items, including the effects of changes in valuation allowances and tax laws or rates, in the interim period in which they occur. Any penalties and/or interest incurred in connection with the payment of the Company’s income tax obligations are classified within general and administrative expense and interest expense, respectively. The computation of the estimated annual ETR for each interim period requires certain estimates and significant judgments, including, but not limited to, the expected operating income for the year, projections of the proportion of income earned and taxed in state jurisdictions, estimates of permanent and temporary differences, and the likelihood of recovering deferred tax assets generated in the current year. The accounting estimates used to compute the provision for income taxes may change as new events occur, additional information is obtained, or the tax environment changes. For the 2014 fiscal year, the Company’s estimated annual ETR is 37.0%, which excludes the impact of changes in the valuation of the Private Placement Warrants and the Contingent consideration liability, as such amounts are excluded from the calculation of taxable income. Given the subjectivity and volatility of the valuation of the Private Placement Warrants, it is not possible to project the impact of the change in the Private Placement Warrants in the computation of the Company’s estimated annual ETR. As a result, the Company’s reported ETR will differ from the estimated annual ETR due to the changes in the valuation of the Private Placement Warrants in the periods in which such changes occur. The income recognized as a result of a change in the value of the Contingent consideration liability is also a non-taxable transaction and the Company’s reported ETR will differ from the estimated annual ETR due to changes in the valuation of the contingent consideration in the periods in which such changes occur. Accordingly, the Company’s reported income tax rate was 28.7% for the nine months ended September 30, 2014, reflecting the effects on income of the changes in the Private Placement Warrant liability and Contingent consideration liability. For the nine months ended September 30, 2013, the Company reported a pre-tax loss. The pre-tax loss was attributable to the expense recognized from a change in the valuation of the Private Placement Warrants during the period, which amount, as noted above, is permanently excluded from the computation of taxable income. As such, the Company’s reported income tax rate was not meaningful for the nine months ended September 30, 2013. Excluding the impact of the changes in the valuation of the Private Placement Warrants and the change in the value of the Contingent consideration liability, on results of operations, the Company’s reported effective income tax rates would have been 37.6% and 35.0% for the nine months ended September 30, 2014 and 2013, respectively.

10. Income taxes

At the end of each interim period, the Company applies its estimated annual effective tax rate (“ETR”) to its interim earnings before considering the tax effect of any discrete items. The Company also records the tax impact of certain unusual or infrequently occurring items, including the effects of changes in valuation allowances and tax laws or rates, in the interim period in which they occur. Any penalties and/or interest incurred in connection with the payment of the Company’s income tax obligations are classified within general and administrative expense and interest expense, respectively.

The computation of the estimated annual ETR for each interim period requires certain estimates and significant judgments, including, but not limited to, the expected operating income for the year, projections of the proportion of income earned and taxed in state jurisdictions, estimates of permanent and temporary differences, and the likelihood of recovering deferred tax assets generated in the current year. The accounting estimates used to compute the provision for income taxes may change as new events occur, additional information is obtained, or the tax environment changes. For the 2014 fiscal year, the Company’s estimated annual ETR is 37.0%, which excludes the impact of changes in the valuation of the Private Placement Warrants and the Contingent consideration liability, as such amounts are excluded from the calculation of taxable income. Given the subjectivity and volatility of the valuation of the Private Placement Warrants, it is not possible to project the impact of the change in the Private Placement Warrants in the computation of the Company’s estimated annual ETR. As a result, the Company’s reported ETR will differ from the estimated annual ETR due to the changes in the valuation of the Private Placement Warrants in the periods in which such changes occur. The income recognized as a result of a change in the value of the Contingent consideration liability is also a non-taxable transaction and the Company’s reported ETR will differ from the estimated annual ETR due to changes in the valuation of the contingent consideration in the periods in which such changes occur. Accordingly, the Company’s reported income tax rate was 28.7% for the nine months ended September 30, 2014, reflecting the effects on income of the changes in the Private Placement Warrant liability and Contingent consideration liability. For the nine months ended September 30, 2013, the Company reported a pre-tax loss. The pre-tax loss was attributable to the expense recognized from a change in the valuation of the Private Placement Warrants during the period, which amount, as noted above, is permanently excluded from the computation of taxable income. As such, the Company’s reported income tax rate was not meaningful for the nine months ended September 30, 2013.

Excluding the impact of the changes in the valuation of the Private Placement Warrants and the change in the value of the Contingent consideration liability, on results of operations, the Company’s reported effective income tax rates would have been 37.6% and 35.0% for the nine months ended September 30, 2014 and 2013, respectively.