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Shareholders' Equity / Partners' Capital (Tables) | 9 Months Ended
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Sep. 30, 2017
Equity [Abstract] |
Noncontrolling Interest Activity in Condensed Consolidated Statements of Operations | The following table summarizes the income or loss allocated to noncontrolling interests as reflected in the Company's condensed consolidated statements of operations for the three and nine months ended September 30, 2017 and 2016:
| For the Three Months Ended |  | For the Nine Months Ended
| September 30, 2017 |  | September 30, 2016 |  | September 30, 2017 |  | September 30, 2016 |
Preferred income allocated to Series C convertible units | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 3,027 |
Net income (loss) allocated to Class A units | 340 |  |  | (27 | ) |  | (30 | ) |  | 108 |
Net income allocated to Series D convertible units | — |  |  | — |  |  | — |  |  | 133 |
Beneficial conversion feature | — |  |  | 7,569 |  |  | — |  |  | 7,569 |
Net (loss) income allocated to noncontrolling interest in a consolidated subsidiary | (31 | ) |  | (226 | ) |  | 8 |  |  | (446 | )
| $ | 309 |  |  | $ | 7,316 |  |  | $ | (22 | ) |  | $ | 10,391 |
Summary of Stock Option Activity under Plan | The following table summarizes stock option activity under the Plan for the nine months ended September 30, 2017 and 2016:
| Shares |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Life (in years) |  | Aggregate Intrinsic Value (1) (in thousands)
Options outstanding at January 1, 2016 | 2,484,400 |  |  | $ | 16.22 |  |  | 8.0 |  | $ | 1,225 |
Granted | 708,000 |  |  | 14.15 |  |  |  |  |  |
Exercised | (172,250 | ) |  | 16.12 |  |  |  |  | 680 |
Forfeited | (153,150 | ) |  | 16.36 |  |  |  |  |  |
Options outstanding at September 30, 2016 | 2,867,000 |  |  | $ | 15.70 |  |  | 7.8 |  | $ | 17,021 |
Options exercisable at September 30, 2016 | 1,051,125 |  |  | $ | 16.04 |  |  | 7.1 |  | $ | 5,885 |
Options outstanding at January 1, 2017 | 2,826,500 |  |  | $ | 15.69 |  |  | 7.6 |  | $ | 14,956 |
Granted | 385,600 |  |  | 23.38 |  |  |  |  |  |
Exercised | (62,655 | ) |  | 15.77 |  |  |  |  | 444 |
Forfeited | (85,250 | ) |  | 16.24 |  |  |  |  |  |
Options outstanding at September 30, 2017 | 3,064,195 |  |  | $ | 16.64 |  |  | 7.1 |  | $ | 16,149 |
Options exercisable at September 30, 2017 | 1,681,595 |  |  | $ | 15.90 |  |  | 6.3 |  | $ | 9,764 |
(1) | Intrinsic value for activities other than exercises is defined as the difference between the grant price and the market value on the last trading day of the period for those stock options where the market value is greater than the exercise price. For exercises, intrinsic value is defined as the difference between the grant price and the market value on the date of exercise.
Summary of Black-Scholes Option Pricing Model Inputs used for Valuation of Stock Options Outstanding | The following table summarizes the Black-Scholes Option Pricing Model inputs used for valuation of the stock options for Class A common shares granted during the nine months ended September 30, 2017 and 2016:
| 2017 |  | 2016
Weighted-average fair value | $ | 3.82 |  |  | $ | 2.82 |
Expected term (years) |  | 7.0 |  |  |  | 7.0 |
Dividend yield |  | 3.0 | % |  |  | 3.0 | %
Volatility |  | 21.3 | % |  |  | 27.3 | %
Risk-free interest rate |  | 2.2 | % |  |  | 1.5 | %
Summary of Restricted Stock Units Activity Under Plan | The following table summarizes the activity that relates to the Company’s restricted stock units under the Plan for the nine months ended September 30, 2017 and 2016:
| 2017 |  | 2016
Restricted stock units at beginning of period | 130,150 |  |  | 91,650 |
Units awarded | 174,000 |  |  | 74,100 |
Units vested | (42,475 | ) |  | (27,250 | )
Units forfeited | (16,200 | ) |  | (6,550 | )
Restricted stock units at end of the period | 245,475 |  |  | 131,950 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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