Equity Incentive Awards	9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity Incentive Awards	Equity Incentive Awards Compensation expense related to restricted stock and stock options, reported in General and administrative on the Consolidated Statements of Income and Comprehensive Income, for the quarters ended September 30, 2018 and 2017 was approximately $2.7 million and $2.6 million, respectively, and for the nine months ended September 30, 2018 and 2017 was approximately $7.3 million and $6.8 million, respectively. Our 2014 Equity Incentive Plan (the “2014 Plan”) was adopted by our Board of Directors on March 11, 2014 and approved by our stockholders on May 13, 2014. Grants under the 2014 Plan are approved by the Compensation Committee, which determines the individuals eligible to receive awards, the types of awards, and the terms, conditions and restrictions applicable to any award, except grants to directors which are approved by the Board of Directors. The Compensation Committee determines the vesting schedule, if any, of each restricted stock grant or stock option grant and the term of each stock option, which term shall not exceed ten years from the date of grant. Shares that do not vest are forfeited. Dividends paid on restricted stock are not returnable, even if the underlying stock does not entirely vest. A maximum of 3,750,000 shares of Common Stock were originally available for grant under the 2014 Plan. As of September 30, 2018, 2,927,923 shares remained available for grant. On February 1, 2018, we awarded 70,250 shares of restricted stock (the “2018 Awards”) at a fair market value of approximately $5.9 million to certain members of our senior management for their service in 2018. These restricted stock grants vest over a three-year vesting period, with one-third vesting on December 28, 2018 and the remaining two-thirds vesting on each of December 28, 2019 and December 28, 2020, respectively (the “Extended Vesting Portion”). One-half of the Extended Vesting Portion of the 2018 Awards provide solely for time-based vesting and will vest in equal installments on December 28, 2019 and December 28, 2020. The remaining one-half of the Extended Vesting Portion of the 2018 Awards provide for performance-based vesting and will vest, subject to the satisfaction of the performance conditions to be established by the Compensation Committee in the year of the vesting period, in equal installments on December 28, 2019 and December 28, 2020. Additionally, on February 1, 2018, we awarded a one-time transition award of time-based restricted stock (the "Transition Awards") as a transition from our prior practice of granting annual restricted stock awards which vest in full on December 31 of the relevant grant year. On February 1, 2018, we awarded Transition Awards for 70,250 shares of common stock at a fair market value of approximately $5.9 million to certain members of our senior management. These Transition Awards are intended to mitigate the impact of a reduction in the realized pay for certain members of our senior management in 2018 and 2019 resulting from the three-year vesting period for the 2018 Awards. Two-thirds of each Transition Award will vest on December 28, 2018, and the remaining one-third will vest on December 28, 2019. The Transition Awards are not subject to performance goals. The Compensation Committee does not intend to replicate these Transition Awards in future years. On May 1, 2018, we awarded to certain members of our Board of Directors, 51,388 shares of Restricted Stock at a fair market value of approximately $4.6 million and Options to purchase 6,270 shares of common stock with an exercise price of $89.65 per share. The shares of common stock covered by these awards are subject to multiple tranches that vest between November 1, 2018 and May 1, 2021. On July 31, 2018, we awarded to certain members of our Board of Directors 617 shares of Restricted Stock at a fair market value of approximately $0.1 million. The shares of common stock covered by these awards are subject to multiple tranches that vest between January 31, 2019 and July 31, 2021. The fair market value of our restricted stock grants was determined by using the closing share price of our common stock on the date the shares were issued. Time-based restricted stock awards are recorded as stock-based compensation expense and paid in capital over the vesting period. Stock-based compensation for restricted stock awards with performance conditions will be recognized using the closing price of our common stock at the grant date when the key terms and conditions are known to all parties.

Equity Incentive Awards

Compensation expense related to restricted stock and stock options, reported in General and administrative on the Consolidated Statements of Income and Comprehensive Income, for the quarters ended September 30, 2018 and 2017 was approximately $2.7 million and $2.6 million, respectively, and for the nine months ended September 30, 2018 and 2017 was approximately $7.3 million and $6.8 million, respectively.

Our 2014 Equity Incentive Plan (the “2014 Plan”) was adopted by our Board of Directors on March 11, 2014 and approved by our stockholders on May 13, 2014. Grants under the 2014 Plan are approved by the Compensation Committee, which determines the individuals eligible to receive awards, the types of awards, and the terms, conditions and restrictions applicable to any award, except grants to directors which are approved by the Board of Directors. The Compensation Committee determines the vesting schedule, if any, of each restricted stock grant or stock option grant and the term of each stock option, which term shall not exceed ten years from the date of grant. Shares that do not vest are forfeited. Dividends paid on restricted stock are not returnable, even if the underlying stock does not entirely vest. A maximum of 3,750,000 shares of Common Stock were originally available for grant under the 2014 Plan. As of September 30, 2018, 2,927,923 shares remained available for grant.

On February 1, 2018, we awarded 70,250 shares of restricted stock (the “2018 Awards”) at a fair market value of approximately $5.9 million to certain members of our senior management for their service in 2018. These restricted stock grants vest over a three-year vesting period, with one-third vesting on December 28, 2018 and the remaining two-thirds vesting on each of December 28, 2019 and December 28, 2020, respectively (the “Extended Vesting Portion”). One-half of the Extended Vesting Portion of the 2018 Awards provide solely for time-based vesting and will vest in equal installments on December 28, 2019 and December 28, 2020. The remaining one-half of the Extended Vesting Portion of the 2018 Awards provide for performance-based vesting and will vest, subject to the satisfaction of the performance conditions to be established by the Compensation Committee in the year of the vesting period, in equal installments on December 28, 2019 and December 28, 2020.

Additionally, on February 1, 2018, we awarded a one-time transition award of time-based restricted stock (the "Transition Awards") as a transition from our prior practice of granting annual restricted stock awards which vest in full on December 31 of the relevant grant year. On February 1, 2018, we awarded Transition Awards for 70,250 shares of common stock at a fair market value of approximately $5.9 million to certain members of our senior management. These Transition Awards are intended to mitigate the impact of a reduction in the realized pay for certain members of our senior management in 2018 and 2019 resulting from the three-year vesting period for the 2018 Awards. Two-thirds of each Transition Award will vest on December 28, 2018, and the remaining one-third will vest on December 28, 2019. The Transition Awards are not subject to performance goals. The Compensation Committee does not intend to replicate these Transition Awards in future years.

On May 1, 2018, we awarded to certain members of our Board of Directors, 51,388 shares of Restricted Stock at a fair market value of approximately $4.6 million and Options to purchase 6,270 shares of common stock with an exercise price of $89.65 per share. The shares of common stock covered by these awards are subject to multiple tranches that vest between November 1, 2018 and May 1, 2021.

On July 31, 2018, we awarded to certain members of our Board of Directors 617 shares of Restricted Stock at a fair market value of approximately $0.1 million. The shares of common stock covered by these awards are subject to multiple tranches that vest between January 31, 2019 and July 31, 2021.

The fair market value of our restricted stock grants was determined by using the closing share price of our common stock on the date the shares were issued. Time-based restricted stock awards are recorded as stock-based compensation expense and paid in capital over the vesting period. Stock-based compensation for restricted stock awards with performance conditions will be recognized using the closing price of our common stock at the grant date when the key terms and conditions are known to all parties.