Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation Expense

Total stock-based compensation expense was as follows:

	Year Ended December 31,
		2015		2014		2013
	(In thousands)
Employee:
Restricted stock and performance shares	$	10,792	$	8,193	$	7,269
Stock options		826		676		900
		11,618		8,869		8,169
Non-employee directors:
Restricted stock		901		900		710
Total stock-based compensation	$	12,519	$	9,769	$	8,879

Assumptions Used for the Black-Scholes Option-Pricing Model to Determine the Per Share Weighted Average Fair Value for Options Granted

The following table represents the assumptions used for the Black-Scholes option-pricing model to determine the per share weighted-average fair value for options granted for the three years ended December 31, 2015:

	2015		2014		2013
Expected life (years)	7.0		5.0		9.9
Risk-free interest rate	1.9	%	1.7	%	1.9	%
Expected volatility	56.7	%	35.5	%	44.3	%
Expected dividend yield	1.1	%	1.0	%	1.2	%

Stock Option Activity

The following table reports stock option activity during the three years ended December 31, 2015 and the intrinsic value as of December 31, 2015:

				Weighted-		Remaining
	Number of			Average		Contractual
	Shares			Exercise Price ($)		Term		Intrinsic Value ($)
								(In thousands)
Outstanding at December 31, 2012		1,429,822			13.62
Granted		51,597			41.75
Canceled		(4,348	)		33.84
Exercised		(256,622	)		12.33
Outstanding at December 31, 2013		1,220,449			15.01
Granted		382			63.07
Canceled		(41,071	)		41.47
Exercised		(165,340	)		15.85
Outstanding at December 31, 2014		1,014,420			13.81
Granted		120,650			88.15
Canceled		-
Exercised		(196,034	)		11.60				15,312
Outstanding at December 31, 2015		939,036			23.83		2.9		82,412
Exercisable at December 31, 2015		790,471			14.07		2.6		77,084

Summary of Performance of Share Activity

The following table reports performance share activity for the three years ended December 31, 2015:

Performance year	2015		2014		2013
Share pay-out at plan		28,520		29,678		42,908
Actual share pay-out in following year		37,076		25,228		46,340
Weighted average fair value per share on grant date	$	70.60	$	63.07	$	35.98

Restricted Stock and Performance Share Activity

The following table reports restricted stock and performance share activity during the three years ended December 31, 2015:

				Weighted-Average
	Number of			Grant Date Fair
	Restricted Shares			Value
Outstanding at December 31, 2012		751,259		$	21.88
Granted		255,266
Performance share pay-out		41,481
Canceled		(93,358	)
Vested		(384,914	)
Outstanding at December 31, 2013		569,734		$	31.86
Granted		149,349
Performance share pay-out		46,340
Canceled		(43,185	)
Vested		(286,249	)
Outstanding at December 31, 2014		435,989		$	41.83
Granted		210,087
Performance share pay-out		25,228
Canceled		(3,845	)
Vested		(235,321	)
Outstanding at December 31, 2015		432,138		$	56.24