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Shareholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2016
Equity [Abstract]  
Noncontrolling Interest Activity in Condensed Consolidated Statements of Operations
The following table summarizes the activity that relates to the Company’s noncontrolling interest as reflected in the condensed consolidated statements of operations for the three and nine months ended September 30, 2016 and 2015:
 
For the Three Months Ended
 
For the Nine Months Ended
 
September 30, 2016
 
September 30, 2015
 
September 30, 2016
 
September 30, 2015

Preferred income allocated to Series C convertible units
$
—

 
$
4,698

 
$
3,027

 
$
14,094

Net (loss) income allocated to Class A units
(27
)
 
(1,575
)
 
108

 
(3,241
)
Net income allocated to Series D convertible units
—

 
—

 
133

 
—

Beneficial conversion feature
7,569

 
—

 
7,569

 
—

Net loss allocated to noncontrolling interests in certain consolidated subsidiaries
(226
)
 
(14
)
 
(446
)
 
(58
)
 
$
7,316

 
$
3,109

 
$
10,391

 
$
10,795
Summary of Stock Option Activity under Plan
The following table summarizes stock option activity under the Plan for the nine months ended September 30, 2016 and 2015:
 
Shares
 
Weighted-
Average
Exercise Price
 
Weighted-
Average
Remaining
Contractual 
Life (in years)
 
Aggregate
Intrinsic
Value (1)
(in thousands)
Options outstanding at January 1, 2015
2,165,000

 
$
16.17

 
8.8
 
$
1,890

Granted
588,500

 
16.49

 
 
 
 

Exercised
(15,000
)
 
15.00

 
 
 
19

Forfeited
(178,500
)
 
16.57

 
 
 
 

Options outstanding at September 30, 2015
2,560,000

 
$
16.23

 
8.3
 
$
557

Options exercisable at September 30, 2015
636,250

 
$
15.94

 
7.7
 
$
273

 
 
 
 
 
 
 
 
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

 
7.84
 
$
17,021

Options exercisable at September 30, 2016
1,051,125

 
$
16.04

 
7.08
 
$
5,885


(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 issued during the nine months ended September 30, 2016 and 2015:
 
2016
 
2015
Weighted-average fair value
$
2.82

 
$
4.57

Expected term (years)
 
7.0

 
 
7.0

Dividend yield
 
3.0
%
 
 
3.0
%
Volatility
 
27.3
%
 
 
35.9
%
Risk-free interest rate
 
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 nine months ended September 30, 2016 and 2015:
 
2016
 
2015
Restricted stock units at beginning of period
91,650

 
85,000

Units awarded
74,100

 
44,000

Units vested
(27,250
)
 
(22,000
)
Units forfeited
(6,550
)
 
(9,700
)
Restricted stock units at end of the period
131,950


97,300