Stock Based Compensation	3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Based Compensation	Stock Based Compensation We account for share-based awards in accordance with ASC Topic 718, Compensation-Stock Compensation, which requires the fair value of stock-based compensation awards to be amortized as an expense over the vesting period. Stock-based compensation awards are valued at the fair value on the date of grant. Compensation expense for awards with performance based conditions is recognized over the vesting period once achievement of the performance condition is deemed probable. During the three months ended March 31, 2019, the Company granted 550,829 shares of time-based restricted stock, and 490,227 of performance stock units, including one award tied to a market performance condition. On the Consolidated Balance Sheets and Statement of Equity, the Company considers unvested shares of restricted stock to be issued, but not outstanding. The Company recorded total stock based compensation expense during the three months ended March 31, 2019 and 2018 of $2.8 million and $3.2 million, respectively. Performance Stock Units With respect to the performance stock units granted to certain employees during the three months ended March 31, 2019, the actual number of such stock units that will be earned is subject to the Company’s achievement of performance targets as of the end of the 2019 fiscal year, with each unit constituting the opportunity to earn up to two shares of Company common stock. The aforementioned awards represent 400,460 stock units that vest in three equal annual installments on March 1st of each of 2020, 2021 and 2022, subject to each grantee’s continued service through each vesting date. Based on the probability assessment as of March 31, 2019, management determined that the currently available data was not sufficient to support that the achievement of the preliminary performance targets is probable, and as such, no compensation expense has been recognized for these awards to date. The Company's Compensation Committee has elected to wait until the second quarter to set the final metric for the performance-based stock units target. Performance Stock Units with Market Condition With respect to the performance based stock units with market condition granted to a certain employee during the three months ended March 31, 2019, the actual number of stock units that will be earned is subject to the Company’s achievement of a pre-established market performance target as of the end of the vesting periods, with each unit constituting the opportunity to earn up to two shares of Company common stock. The aforementioned award represents 89,767 stock units that vest in two annual installments at the end of each performance period, subject to grantee’s continued service through each vesting date. Time-Based Restricted Stock Awards With respect to the restricted stock awards granted to certain employees during the three months ended March 31, 2019, 285,030 of such shares vest in three equal annual installments on each anniversary of the grant date, 134,650 of such shares vest in one installment on January 2, 2022, and 84,156 of such shares vest in two equal annual installments on each anniversary of the grant date, subject to the grantee’s continued service through each vesting date. With respect to the restricted stock awards granted to certain non-employee directors during the three months ended March 31, 2019, 46,993 of such shares vest in four equal quarterly installments on each three-month period beginning June 1st of 2019, subject to each grantee’s continued service on the board through each vesting date.

Stock Based Compensation

We account for share-based awards in accordance with ASC Topic 718, Compensation-Stock Compensation, which requires the fair value of stock-based compensation awards to be amortized as an expense over the vesting period. Stock-based compensation awards are valued at the fair value on the date of grant. Compensation expense for awards with performance based conditions is recognized over the vesting period once achievement of the performance condition is deemed probable.

During the three months ended March 31, 2019, the Company granted 550,829 shares of time-based restricted stock, and 490,227 of performance stock units, including one award tied to a market performance condition. On the Consolidated Balance Sheets and Statement of Equity, the Company considers unvested shares of restricted stock to be issued, but not outstanding.

The Company recorded total stock based compensation expense during the three months ended March 31, 2019 and 2018 of $2.8 million and $3.2 million, respectively.

Performance Stock Units

With respect to the performance stock units granted to certain employees during the three months ended March 31, 2019, the actual number of such stock units that will be earned is subject to the Company’s achievement of performance targets as of the end of the 2019 fiscal year, with each unit constituting the opportunity to earn up to two shares of Company common stock. The aforementioned awards represent 400,460 stock units that vest in three equal annual installments on March 1st of each of 2020, 2021 and 2022, subject to each grantee’s continued service through each vesting date. Based on the probability assessment as of March 31, 2019, management determined that the currently available data was not sufficient to support that the achievement of the preliminary performance targets is probable, and as such, no compensation expense has been recognized for these awards to date. The Company's Compensation Committee has elected to wait until the second quarter to set the final metric for the performance-based stock units target.

Performance Stock Units with Market Condition

With respect to the performance based stock units with market condition granted to a certain employee during the three months ended March 31, 2019, the actual number of stock units that will be earned is subject to the Company’s achievement of a pre-established market performance target as of the end of the vesting periods, with each unit constituting the opportunity to earn up to two shares of Company common stock. The aforementioned award represents 89,767 stock units that vest in two annual installments at the end of each performance period, subject to grantee’s continued service through each vesting date.

Time-Based Restricted Stock Awards

With respect to the restricted stock awards granted to certain employees during the three months ended March 31, 2019, 285,030 of such shares vest in three equal annual installments on each anniversary of the grant date, 134,650 of such shares vest in one installment on January 2, 2022, and 84,156 of such shares vest in two equal annual installments on each anniversary of the grant date, subject to the grantee’s continued service through each vesting date. With respect to the restricted stock awards granted to certain non-employee directors during the three months ended March 31, 2019, 46,993 of such shares vest in four equal quarterly installments on each three-month period beginning June 1st of 2019, subject to each grantee’s continued service on the board through each vesting date.