Stock Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2017

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

Summary of valuation assumptions

The weighted average assumptions used in the determination of fair value for stock option awards were as follows:

	2015
Risk free interest rate	1.80	%
Dividend yield	1.58	%
Volatility factor of the expected market price of the common shares	0.35
Expected life for the options (in years)	5.50

	2017
Risk free interest rate	1.55	%
Dividend yield	—	%
Volatility factor of the expected market price of the common shares	0.41
Expected term (in years)	2.83
Correlation coefficient	0.40

Schedule of stock options rollforward

A reconciliation of the number of Options outstanding and exercisable under the 2014 LT Plan as of December 31, 2017, and changes during the period then ended, is as follows:

	Shares (in thousands)	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value (000's)
Options outstanding at January 1, 2017	325	$	35.40
Options granted	—	—
Options exercised	—	—
Options cancelled / forfeited	—	—
Options outstanding at December 31, 2017	325	$	35.40	0.84	$	—
Vested and expected to vest at December 31, 2017	325	$	35.40	0.84	$	—
Options exercisable at December 31, 2017	217	$	35.40	0.84	$	—

Summary of stock options

	Year ended December 31,
(in thousands)	2017
Total intrinsic value of Options exercised	$	—
Total fair value of shares vested	$	1,123
Weighted average fair value of Options granted	$	—

Summary of nonvested restricted shares

A summary of the status of the Company's non-vested restricted shares as of December 31, 2017, and changes during the period then ended, is presented below:

	Shares (in thousands)		Weighted-Average Grant-Date Fair Value
Non-vested restricted shares at January 1, 2017	223		$	31.93
Granted	134		37.13
Vested	(113	)	33.12
Forfeited	(15	)	34.49
Non-vested restricted shares at December 31, 2017	229		$	34.22

	Year ended December 31,
	2017	2016	2015
Total fair value of shares vested (000's)	$3,751	$4,038	$4,918
Weighted average fair value of restricted shares granted	$37.13	$27.20	$42.32

Summary of nonvested performance share units

A summary of the status of the Company's EPS PSUs as of December 31, 2017, and changes during the period then ended, is presented below:

	Shares (in thousands)		Weighted-Average Grant-Date Fair Value
Non-vested at January 1, 2017	304		$	40.76
Granted	84		39.20
Vested	—		—
Forfeited	(113	)	49.67
Non-vested at December 31, 2017	275		$	36.61

	Year ended December 31,
	2017	2016	2015
Weighted average fair value of PSUs granted	$39.20	$27.54	$44.76

A summary of the status of the Company's PSUs as of December 31, 2017, and changes during the period then ended, is presented below:

	Shares (in thousands)		Weighted-Average Grant-Date Fair Value
Non-vested at January 1, 2017	118		$	26.43
Granted	84		42.53
Vested	—		—
Forfeited	(19	)	32.04
Non-vested at December 31, 2017	183		$	33.26

	Year ended December 31,
	2017		2016		2015
Weighted average fair value of PSUs granted	$	42.53	$	26.43	$	—

Fair value of the option component of the ESP Plan

	2017		2016		2015
Risk free interest rate	1.76	%	0.61	%	0.25	%
Dividend yield	2.06	%	1.96	%	1.05	%
Volatility factor of the expected market price of the common shares	0.28		0.36		0.41
Expected life for the options (in years)	1.00		1.00		1.00