Income Taxes	3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Since inception, the Company has operated solely within the United States. The Company’s effective income tax rate was 18.3% and (37.7)% for the three months ended March 31, 2018 and 2017, respectively. The significant drivers of the effective tax rate are allocation of income to noncontrolling interests and the overall favorable impact of the Tax Cuts and Job Act ("Tax Act") for the three months March 31, 2018, and noncontrolling interests and the domestic activities deduction for the three months ended March 31, 2017. Management assesses its deferred tax assets to determine whether all or any portion of the asset is more likely than not unrealizable under ASC 740. The Company is required to establish a valuation allowance for any portion of the asset that management concludes is more likely than not to be unrealizable. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. The Company's assessment considers all evidence, both positive and negative, including the nature, frequency and severity of any current and cumulative losses, taxable income in carry back years, the scheduled reversal of deferred tax liabilities, tax planning strategies, and projected future taxable income in making this assessment. At March 31, 2018, the Company had no valuation allowance recorded. At March 31, 2018, the Company had no remaining federal net operating loss carryforwards and $49.9 million of remaining state net operating loss carryforwards. State net operating loss carryforwards begin to expire in 2031. In addition, as of March 31, 2018, the Company had unused federal and state built-in losses of $48.5 million and $7.5 million, respectively. The five year testing period for built-in losses expired in 2017 and the unused built-in loss carryforwards begin to expire in 2032. The Company had AMT credit carryovers of $1.4 million at March 31, 2018, which if not previously utilized are allowable as refundable credits under the Tax Cuts and Job Act through 2022. In accordance with Securities & Exchange Commission Staff issued Staff Accounting Bulletin No. 118 (“SAB 118”), based on the information available as of December 31, 2017, the Company recorded income tax expense of $23.1 million as a result of the Tax Act due to the reduction of the Company's deferred tax assets as a result of the lower tax rate. The Company has also recorded a provisional amount in relation to the treatment of AMT credits in its consolidated financial statements for the year ended December 31, 2017. The final impact of the Tax Act may differ from the provisional amount recorded at December 31, 2017, due to, among other things, changes in interpretations and assumptions the Company has made, guidance that may be issued and actions the Company may take as a result of the Tax Act. There were no significant changes to any of the provisional balances recorded at December 31, 2017 as a result of the Tax Act during the first three months of 2018. FASB ASC Topic 740, Income Taxes (“ASC 740”), prescribes a recognition threshold and a measurement criterion for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be considered more likely than not to be sustained upon examination by taxing authorities. The Company records interest and penalties related to uncertain tax positions as a component of the provision for income taxes. The Company has no unrecognized tax benefits. The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction and various state jurisdictions. The Company is subject to U.S. federal income tax examination for calendar tax years ended 2012 and forward. The Company is subject to various state income tax examinations for calendar tax years ended 2008 and forward. The Company is currently under examination by the Internal Revenue Service for the 2013 and 2014 tax years and a California examination is pending for the 2014 tax year.

Income Taxes

Since inception, the Company has operated solely within the United States. The Company’s effective income tax rate was 18.3% and (37.7)% for the three months ended March 31, 2018 and 2017, respectively. The significant drivers of the effective tax rate are allocation of income to noncontrolling interests and the overall favorable impact of the Tax Cuts and Job Act ("Tax Act") for the three months March 31, 2018, and noncontrolling interests and the domestic activities deduction for the three months ended March 31, 2017.

Management assesses its deferred tax assets to determine whether all or any portion of the asset is more likely than not unrealizable under ASC 740. The Company is required to establish a valuation allowance for any portion of the asset that management concludes is more likely than not to be unrealizable. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. The Company's assessment considers all evidence, both positive and negative, including the nature, frequency and severity of any current and cumulative losses, taxable income in carry back years, the scheduled reversal of deferred tax liabilities, tax planning strategies, and projected future taxable income in making this assessment. At March 31, 2018, the Company had no valuation allowance recorded.

At March 31, 2018, the Company had no remaining federal net operating loss carryforwards and $49.9 million of remaining state net operating loss carryforwards. State net operating loss carryforwards begin to expire in 2031. In addition, as of March 31, 2018, the Company had unused federal and state built-in losses of $48.5 million and $7.5 million, respectively. The five year testing period for built-in losses expired in 2017 and the unused built-in loss carryforwards begin to expire in 2032. The Company had AMT credit carryovers of $1.4 million at March 31, 2018, which if not previously utilized are allowable as refundable credits under the Tax Cuts and Job Act through 2022.

In accordance with Securities & Exchange Commission Staff issued Staff Accounting Bulletin No. 118 (“SAB 118”), based on the information available as of December 31, 2017, the Company recorded income tax expense of $23.1 million as a result of the Tax Act due to the reduction of the Company's deferred tax assets as a result of the lower tax rate. The Company has also recorded a provisional amount in relation to the treatment of AMT credits in its consolidated financial statements for the year ended December 31, 2017. The final impact of the Tax Act may differ from the provisional amount recorded at December 31, 2017, due to, among other things, changes in interpretations and assumptions the Company has made, guidance that may be issued and actions the Company may take as a result of the Tax Act. There were no significant changes to any of the provisional balances recorded at December 31, 2017 as a result of the Tax Act during the first three months of 2018.

FASB ASC Topic 740, Income Taxes (“ASC 740”), prescribes a recognition threshold and a measurement criterion for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be considered more likely than not to be sustained upon examination by taxing authorities. The Company records interest and penalties related to uncertain tax positions as a component of the provision for income taxes. The Company has no unrecognized tax benefits.

The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction and various state jurisdictions. The Company is subject to U.S. federal income tax examination for calendar tax years ended 2012 and forward. The Company is subject to various state income tax examinations for calendar tax years ended 2008 and forward. The Company is currently under examination by the Internal Revenue Service for the 2013 and 2014 tax years and a California examination is pending for the 2014 tax year.