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Shareholders' Equity / Partners' Capital (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Noncontrolling Interest
The following table summarizes the income or loss allocated to noncontrolling interests as reflected in the Company's consolidated statements of operations for the years ended December 31, 2017, 2016 and 2015 (in thousands):
 
For the Years Ended December 31,
 
2017
 
2016
 
2015
 Preferred income allocated to Series C convertible units
$
—

 
$
3,027

 
$
18,792

 Net loss allocated to Class A units
(4,648
)
 
(6,417
)
 
(4,282
)
 Net income allocated to Series D convertible units
—

 
134

 
—

 Beneficial conversion feature related to Series D and E convertible units
—

 
7,569

 
—

 Net income (loss) allocated to noncontrolling interests in certain consolidated subsidiaries
141

 
(562
)
 
(157
)
 
$
(4,507
)
 
$
3,751

 
$
14,353
Summary of Stock Option Activity Under Plan
The following table summarizes stock option activity under the Plan for the years ended December 31, 2017, 2016 and 2015:
 
Shares
 
Weighted- Average Exercise Price
 
Weighted- Average Remaining Contractual Life (in years)
 
Aggregate Intrinsic Value (1) (in thousands)
Options outstanding at December 31, 2014
2,165,000

 
$
16.17

 
8.8
 
$
1,890

Granted
588,500

 
16.49

 
 
 
 

Exercised
(16,600
)
 
15.16

 
 
 
19

Forfeited
(252,500
)
 
16.57

 
 
 
 

Options outstanding at December 31, 2015
2,484,400

 
$
16.22

 
8.0
 
$
1,225

Granted
708,000

 
14.15

 
 
 
 

Exercised
(196,000
)
 
16.18

 
 
 
790

Forfeited
(169,900
)
 
16.38

 
 
 
 
Options outstanding at December 31, 2016
2,826,500

 
$
15.69

 
7.6
 
$
14,956

Granted
385,200

 
23.38

 
 
 
 
Exercised
(74,000
)
 
15.65

 
 
 
520

Forfeited
(85,250
)
 
16.24

 
 
 
 
Options outstanding at December 31, 2017
3,052,450

 
$
16.65

 
6.9
 
$
16,421

Options exercisable at December 31, 2017
1,782,750

 
$
15.92

 
6.1
 
$
10,558


(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 years ended December 31, 2017, 2016 and 2015:
 
2017
 
2016
 
2015
Weighted-average fair value
$
3.82

 
$
2.82

 
$
4.57

Expected term (years)
 
7.0

 
 
7.0

 
 
7.0

Dividend yield
 
3.0
%
 
 
3.0
%
 
 
3.0
%
Volatility
 
21.3
%
 
 
27.3
%
 
 
35.9
%
Risk-free interest rate
 
2.2
%
 
 
1.5
%
 
 
1.9
%
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 years ended December 31, 2017, 2016 and 2015:
 
2017
 
2016
 
2015
Restricted stock units at beginning of period
130,150

 
91,650

 
85,000

Units awarded
174,400

 
74,100

 
44,000

Units vested
(42,475
)
 
(27,250
)
 
(22,000
)
Units forfeited
(18,200
)
 
(8,350
)
 
(15,350
)
Restricted stock units at end of the period
243,875

 
130,150

 
91,650