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Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2016
Compensation Related Costs [Abstract] |  |
Schedule of performance share awards under equity incentive compensation plan | A summary of the status and activity of non-vested PSUs is presented in the following table:
| For the Years Ended December 31,
| 2016 |  | 2015 |  | 2014
| PSUs |  | Weighted-Average Grant-Date Fair Value |  | PSUs |  | Weighted-Average Grant-Date Fair Value |  | PSUs |  | Weighted-Average Grant-Date Fair Value
Non-vested at beginning of year (1) | 626,328 |  |  | $ | 61.81 |  |  | 433,660 |  |  | $ | 73.63 |  |  | 572,469 |  |  | $ | 66.07 |
Granted (1) | 447,971 |  |  | $ | 26.56 |  |  | 320,753 |  |  | $ | 45.34 |  |  | 202,404 |  |  | $ | 94.66 |
Vested (1) | (130,353 | ) |  | $ | 64.17 |  |  | (76,438 | ) |  | $ | 51.76 |  |  | (206,830 | ) |  | $ | 64.79 |
Forfeited (1) | (115,023 | ) |  | $ | 55.59 |  |  | (51,647 | ) |  | $ | 73.62 |  |  | (134,383 | ) |  | $ | 86.72 |
Non-vested at end of year(1) | 828,923 |  |  | $ | 43.25 |  |  | 626,328 |  |  | $ | 61.81 |  |  | 433,660 |  |  | $ | 73.63 |
____________________________________________
(1) | The number of awards assumes a multiplier of one. The final number of shares of common stock issued may vary depending on the three-year performance multiplier, which ranges from zero to two.
| [1]
Schedule of Shares Settled, Performance Share Units [Table Text Block] | A summary of the shares of common stock issued to settle PSUs is presented in the table below:
| For the Years Ended December 31,
| 2016 |  | 2015 |  | 2014
Shares of common stock issued to settle PSUs (1) | 44,870 |  |  | 288,962 |  |  | 130,163 |
Less: shares of common stock withheld for income and payroll taxes | (14,809 | ) |  | (100,683 | ) |  | (45,042 | )
Net shares of common stock issued | 30,061 |  |  | 188,279 |  |  | 85,121 |
Multiplier earned | 0.2 |  |  | 1.0 |  |  | 0.55 |
____________________________________________
(1) | During the years ended December 31, 2016, 2015, and 2014, the Company issued shares of common stock for PSUs granted in 2013, 2012, and 2011. The Company and the majority of grant recipients mutually agreed to net share settle a portion of the awards to cover income and payroll tax withholdings in accordance with the Company’s Equity Plan and individual award agreements.
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | A summary of the status and activity of non-vested RSUs is presented below:
| For the Years Ended December 31,
| 2016 |  | 2015 |  | 2014
| RSUs |  | Weighted- Average Grant-Date Fair Value |  | RSUs |  | Weighted- Average Grant-Date Fair Value |  | RSUs |  | Weighted- Average Grant-Date Fair Value
Non-vested at beginning of year | 543,737 |  |  | $ | 55.01 |  |  | 515,724 |  |  | $ | 68.29 |  |  | 580,431 |  |  | $ | 57.05 |
Granted | 417,065 |  |  | $ | 28.08 |  |  | 356,246 |  |  | $ | 43.72 |  |  | 234,560 |  |  | $ | 83.98 |
Vested | (241,363 | ) |  | $ | 58.06 |  |  | (278,289 | ) |  | $ | 63.12 |  |  | (253,031 | ) |  | $ | 58.19 |
Forfeited | (115,323 | ) |  | $ | 43.52 |  |  | (49,944 | ) |  | $ | 66.53 |  |  | (46,236 | ) |  | $ | 62.06 |
Non-vested at end of year | 604,116 |  |  | $ | 37.39 |  |  | 543,737 |  |  | $ | 55.01 |  |  | 515,724 |  |  | $ | 68.29 |
Schedule of Shares Settled, Restricted Stock Units [Table Text Block] | A summary of the shares of common stock issued to settle RSUs is presented in the table below:
| For the Years Ended December 31,
| 2016 |  | 2015 |  | 2014
Shares of common stock issued to settle RSUs (1) | 241,363 |  |  | 278,289 |  |  | 253,031 |
Less: shares of common stock withheld for income and payroll taxes | (72,181 | ) |  | (91,045 | ) |  | (81,434 | )
Net shares of common stock issued | 169,182 |  |  | 187,244 |  |  | 171,597 |
____________________________________________
(1) | During the years ended December 31, 2016, 2015, and 2014, the Company issued shares of common stock for RSUs granted in previous years. The Company and the majority of grant recipients mutually agreed to net share settle a portion of the awards to cover income and payroll tax withholdings in accordance with the Company’s Equity Plan and individual award agreements.
Schedule of stock option grants under prior stock option plans | A summary of activity associated with the Company’s Stock Option Plans during the year ended December 31, 2014, is presented in the following table:
| Shares |  | Weighted-Average Exercise Price |  | Aggregate Intrinsic Value
For the year ended December 31, 2014 |  |  |  |  |
Outstanding, start of year | 39,088 |  |  | $ | 20.87 |  |  | $ | — |
Exercised | (39,088 | ) |  | $ | 20.87 |  |  | $ | 1,993,726 |
Forfeited | — |  |  | $ | — |  |  | $ | — |
Outstanding, end of year | — |  |  | $ | — |  |  | $ | — |
Vested and exercisable at end of year | — |  |  | $ | — |  |  | $ | — |
Schedule of employee stock purchase plan | The fair value of ESPP shares issued during the periods reported were estimated using the following weighted-average assumptions:
| For the Years Ended December 31,
| 2016 |  | 2015 |  | 2014
Risk free interest rate | 0.4 | % |  | 0.1 | % |  | 0.1 | %
Dividend yield | 0.4 | % |  | 0.2 | % |  | 0.1 | %
Volatility factor of the expected market price of the Company’s common stock | 95.0 | % |  | 61.2 | % |  | 33.0 | %
Expected life (in years) | 0.5 |  |  | 0.5 |  |  | 0.5 |
Schedule of net profits plan cash payment allocation | The following table presents cash payments made or accrued under the Net Profits Plan related to periodic operations, of which the majority is recorded as general and administrative expense, and cash payments made or accrued as a result of divestitures of properties subject to the Net Profits Plan, which are recorded as a reduction to the net gain on divestiture activity line item in the accompanying statements of operations.
| For the Years Ended December 31,
| 2016 |  | 2015 |  | 2014
| (in thousands)
Cash payments made or accrued related to operations | $ | 6,608 |  |  | $ | 3,498 |  |  | $ | 9,016 |
Cash payments made or accrued related to divestitures | 24,349 |  |  | 3,789 |  |  | 8,341 |
Total net settlements | $ | 30,957 |  |  | $ | 7,287 |  |  | $ | 17,357 |
[1] | The number of awards assumes a multiplier of one. The final number of shares of common stock issued may vary depending on the three-year performance multiplier, which ranges from zero to two.

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