Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Stock-based compensation

Schedule of portion of nonvested Common Shares earned based upon achievement of compounded annual book value per share growth

The portion of the nonvested performance-based share awards that will be earned based upon the achievement of compounded annual book value per share growth is as follows:

Performance level	Compounded Annual Book Value Per Share Growth		Nonvested Common Shares Earned
	<11	%	0	%
Threshold	11	%	10	%
	12	%	36	%
	13	%	61	%
	14	%	87	%
Maximum	≥15	%	100	%

Summary of nonvested Common Share and nonvested Common Share unit activity

The following tables summarize nonvested Common Share and nonvested Common Share unit activity for the year ended December 31:

	2015
	Time and Performance- Based Share Awards				Time-Based Share Awards				Share Units
(Shares in thousands)	Number of Shares		Weighted Average Grant Date Fair Value		Number of Shares		Weighted Average Grant Date Fair Value		Number of Share Units		Weighted Average Grant Date Fair Value
Outstanding at beginning of year	1,290		$	14.83	1,472		$	9.04	664		$	18.32
Granted	50		24.58		109		24.51		129		24.47
Vested	—		N/A		(644	)	6.67		(239	)	18.18
Forfeited	(46	)	16.40		(47	)	15.50		(10	)	17.89
Outstanding at end of year	1,294		$	15.15	890		$	12.31	544		$	19.84

	2014
	Time and Performance- Based Share Awards			Time-Based Share Awards				Share Units
(Shares in thousands)	Number of Shares	Weighted Average Grant Date Fair Value		Number of Shares		Weighted Average Grant Date Fair Value		Number of Share Units		Weighted Average Grant Date Fair Value
Outstanding at beginning of year	1,238	$	14.50	2,839		$	4.82	528		$	17.03
Granted	52	22.68		82		23.47		188		21.95
Vested	—	N/A		(1,434	)	1.57		(26	)	19.00
Forfeited	—	N/A		(15	)	2.70		(26	)	17.83
Outstanding at end of year	1,290	$	14.83	1,472		$	9.04	664		$	18.32

Schedule of compensation expense, net of forfeitures, and related tax effects recognized in connection with nonvested shares

Compensation expense, net of forfeitures, and related tax effects recognized in connection with nonvested shares were as follows for the years ended December 31:

(In thousands)	2015		2014		2013
Compensation expense	$	13,633	$	12,520	$	3,597
Income tax benefit	4,378		4,382		1,259

Class B-2 Common Shares

Stock-based compensation

Summary of nonvested common share activity

The following table summarizes nonvested Class B-2 common share activity for the year ended December 31:

	2013
(Shares in thousands)	Number of Shares		Weighted Average Grant Date Fair Value
Outstanding at beginning of year	5,461		$	0.11
Granted	96		1.80
Vested	(1,209	)	0.10
Forfeited	(2,614	)	0.13
Converted to Common Shares	(1,734	)	0.17
Outstanding at end of year	—		N/A

Class A Common Shares

Stock-based compensation

Summary of nonvested common share activity

The following table summarizes nonvested Class A common share activity for the year ended December 31:

	2013
(Shares in thousands)	Number of Shares		Weighted Average Grant Date Fair Value
Outstanding at beginning of year	199		$	10.08
Granted	239		10.92
Vested	—		N/A
Forfeited	(9	)	10.59
Converted to Common Shares	(429	)	8.01
Outstanding at end of year	—		N/A