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Equity-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2017

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable [Table Text Block]

A summary of the status of exercisable stock option awards as of December 31, 2017, and changes during the year, is presented below:

		Shares			Weighted Average Exercise Price				Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value
Exercisable options at January 1, 2017		137,860			$	66.85
Expired		(5,913	)		66.97
Exercisable options at December 31, 2017		131,947			$	66.85			6.0		$	—

Employee Equity-Based Compensation Expense

Employee equity-based compensation expense was recognized as follows:

(In thousands)		2017				2016				2015
Restricted stock units		$	1,618			$	1,381			$	2,116
Performance shares		2,283				3,311				4,408
Stock options		2,552				2,913				2,106
Total employee equity-based compensation		$	6,453			$	7,605			$	8,630
Related tax benefit		$	2,149			$	2,767			$	3,193

Summary of Status of Outstanding RSU Awards

A summary of the status of outstanding unvested RSU awards as of December 31, 2017, 2016, and 2015, and changes during those years, is presented below:

		2017							2016							2015
		Shares			Weighted Average Grant Date Fair Value				Shares			Weighted Average Grant Date Fair Value				Shares			Weighted Average Grant Date Fair Value
Unvested shares outstanding at
January 1		54,460			$	47.16			46,029			$	60.17			93,254			$	47.95
Granted		66,774			56.45				44,627			39.10				23,148			62.02
Vested		(17,531	)		62.75				(29,338	)		55.16				(65,217	)		43.86
Forfeited		(9,232	)		53.52				(6,858	)		47.80				(5,156	)		58.58
Unvested shares outstanding at   December 31		94,471			50.22				54,460			47.16				46,029			60.17
Aggregate intrinsic value (in   thousands)					$	4,289						$	3,570						$	2,096

Schedule of Share-based Compensation, Activity [Table Text Block]

A summary of the status of outstanding stock option awards as of December 31, 2017, and changes during the year, is presented below:

			Shares			Weighted Average Exercise Price				Weighted Average Grant Date Fair Value				Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value
Outstanding options at December 31, 2014			150,580			$	66.84									$	258
Granted			142,542			61.93				$	20.82
Forfeited			(15,429	)		64.12
Outstanding options at December 31, 2015			277,693			$	64.47									$	—
Granted			280,191			38.86				14.42
Forfeited			(30,830	)		47.79
Outstanding options at   December 31, 2016			527,054			$	51.83									$	7,232
Granted			158,484			56.45				18.82
Forfeited			(22,306	)		50.74
Expired			(5,913	)		66.97
Outstanding options at   December 31, 2017	2,017		657,319			$	52.84							7.4		$	—

Assumption Used in Black-Scholes Option-Pricing Model to Estimate Fair Value of Stock Options

Volatility	30	%
Risk-free interest rate	2.05	%
Expected life-years	6.0

The fair value of performance share awards is estimated using a Monte Carlo simulation model. For performance shares granted in 2017, the following assumptions were used in our Monte Carlo model:

Closing price of stock on date of grant	$	56.75
Risk free rate	1.42		%
Measurement period	3 years
Volatility	35		%

Summary of Status of Outstanding Performance Share Awards

A summary of the status of outstanding performance share awards as of December 31, 2017, 2016, and 2015, and changes during those years, is presented below:

		2017							2016							2015
		Shares			Weighted Average Grant Date Fair Value				Shares			Weighted Average Grant Date Fair Value				Shares			Weighted Average Grant Date Fair Value
Outstanding share awards at   January 1		175,683			$	62.26			92,563			$	84.18			300,864			$	59.77
Granted		33,907			58.58				93,397			39.70				47,513			62.05
Settled		(87,491	)		84.65				—			—				(245,525	)		50.43
Forfeited		(4,847	)		47.61				(10,277	)		54.55				(10,289	)		73.61
Outstanding share awards at   December 31		117,252			45.10				175,683			62.26				92,563			84.18
Aggregate intrinsic value (in   thousands)					$	5,323						$	11,516						$	4,214

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- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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Tabular disclosure of the changes in outstanding nonvested restricted stock units.

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Tabular disclosure of the changes in other outstanding share-based compensation awards other than stock options or nonvested awards.

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Tabular disclosure of the following for fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position: the number, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term of options (or share units) currently exercisable (or convertible).

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