Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of nonvested Common Share and nonvested Common Share unit activity

The following table summarizes nonvested common share and nonvested common share unit activity for the nine months ended September 30, 2016:

	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	1,294	$	15.15	890		$	12.31	544		$	19.84
Granted	209	17.01		181		17.01		205		17.78
Vested	—	N/A		(441	)	9.46		(250	)	19.62
Forfeited	—	N/A		(5	)	0.23		(11	)	18.12
Outstanding at September 30, 2016	1,503	$	15.41	625		$	15.79	488		$	19.13

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
	<13	%	0	%
Threshold	13	%	25	%
	14	%	50	%
	15	%	75	%
Maximum	≥16	%	100	%

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 was as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(In thousands)	2016		2015		2016		2015
Compensation expense	$	3,953	$	3,363	$	11,902	$	9,959
Income tax benefit	1,270		1,072		3,828		3,197