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Shareholders' Equity / Partners' Capital (Tables)
 9 Months Ended
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