Stock Based Compensation	9 Months Ended
Stock Based Compensation	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Based Compensation	Stock Based Compensation In 2011 and 2013 prior to the IPO, certain employees of the Company were granted long-term incentive awards which provided them with equity interests as an incentive to remain in the Company’s service and align executives’ interests with those of the Company’s equity holders. The awards were granted to such employees by the Partnerships, in the form of Class B Units in each of the Partnerships. The awards were granted with service, performance and market conditions. In connection with the IPO, certain of these awards vested and the vested awards were exchanged for a combination of vested common shares of the Company and vested shares of BPG Sub. The remaining unvested Class B Units as of the IPO effective date were exchanged for a combination of unvested restricted common shares of the Company and unvested restricted common shares of BPG Sub, (collectively, the “RSAs”). The RSAs are subject to the same vesting terms as those applicable to the exchanged Class B Units. During the nine months ended September 30, 2015, the achievement of the performance condition became probable and the Company recognized $9.9 million of equity based compensation expense as a component of General and administrative expense in the Consolidated Statements of Operations. In connection with the IPO, the Board of Directors approved the 2013 Omnibus Incentive Plan (the “Plan”). The Plan provides for a maximum of 15.0 million shares of the Company’s common stock to be issued for qualified and non-qualified options, stock appreciation rights, restricted stock and restricted stock units, OP Units in the Operating Partnership, performance awards and other stock-based awards. During the nine months ended September 30, 2015 and year ended December 31, 2014, the Company granted restricted stock units (“RSUs”) in the Company to certain employees, or at the election of certain employees, long-term incentive plan units (“LTIP Units”) in the Operating Partnership. The RSUs and LTIP Units are divided into multiple tranches, with each tranche subject to separate performance-based vesting conditions, market-based vesting conditions and service-based vesting conditions. Each award contains a threshold, target, and maximum number of units in respect to each tranche. The number of units actually earned for each tranche is determined based on performance during a specified performance period, and the earned units are then further subject to time-based vesting conditions. The aggregate number of RSUs and LTIP Units granted, assuming that the target level of performance is achieved, was 0.6 million and 0.6 million for the nine months ended September 30, 2015 and year ended December 31, 2014, respectively, with service periods ranging from one to five years. The Company recognized $3.8 million and $1.9 million of equity based compensation expense for the three months ended September 30, 2015 and 2014, respectively. The Company recognized $19.3 million and $7.0 million of equity based compensation expense for the nine months ended September 30, 2015 and 2014, respectively. As of September 30, 2015, the Company had $14.6 million of total unrecognized compensation cost related to unvested stock compensation expected to be recognized over a weighted average period of approximately 2.3 years.