Stock-Based Compensation (Table)

12 Months Ended

Dec. 31, 2013

Stock based compensation

Stock-based compensation, fair value assumptions

	2013	2012	2011
Expected life	4.6-9.0 years	4.5 years	4.3 years
Expected volatility	29.2%-39.6%	40.7%-42.6%	43.4%-44.8%
Dividend yield	0%	0%	0%
Risk-free interest rate	0.7%-2.4%	0.5%-0.9%	0.7%-2.0%
Estimated annual forfeiture rate	0.0%-8.1%	0.0%-9.1%	0.0%-7.8%

Summary of stock options

Common Share Options		Number of Options	Weighted Average Exercise Price		Weighted Average Grant Date Fair Value		Aggregate Intrinsic Value		Weighted Average Remaining Contractual Life (in years)
Outstanding at December 31, 2010		2,627,000	$	42.28
(1,333,000 exercisable)				47.18
	Granted	694,000		44.34	$	16.66
	Exercised	(201,000)		32.32			$	2,099,000
	Forfeited	(83,000)		39.42
	Expired	(203,000)		49.32
Outstanding at December 31, 2011		2,834,000	$	43.07
(1,533,000 exercisable)				46.23
	Granted	677,000		34.91	$	12.61
	Exercised	(47,000)		29.82			$	205,000
	Forfeited	(117,000)		38.45
	Expired	(133,000)		46.17
Outstanding at December 31, 2012		3,214,000	$	41.58
(1,928,000 exercisable)			$	43.99
	Granted	1,213,000		32.45	$	11.53
	Exercised	(892,000)		34.78			$	6,787,000
	Forfeited	(574,000)		34.17
	Expired	(247,000)		48.35
Outstanding at December 31, 2013		2,714,000	$	42.22			$	13,015,000	6.80
(1,359,000 exercisable)			$	46.91			$	2,632,000	4.60

Summary of nonvested restricted stock units

Common Restricted Stock Units	Number	Weighted Average Grant Date Fair Value
Nonvested at December 31, 2012	1,139,000	$	38.40
Granted	601,000		32.06
Vested	(238,000)		42.26
Forfeited	(332,000)		35.63
Nonvested at December 31, 2013	1,170,000	$	36.46

Stock-based compensation

Year Ended December 31,	2013		2012		2011
(Dollars in thousands)
Stock option awards	$	5,810	$	8,471	$	9,549
Restricted stock unit awards		9,485		12,300		10,037
Deferred compensation bonus and matching stock unit awards		2		240		12
Awards under employee stock purchase plan		-		-		255
Awards under Non-Employee Director compensation plan		547		455		330
Total stock-based compensation, before income taxes		15,844		21,466		20,183
Income tax benefit		(5,984)		(8,121)		(7,581)
Total stock-based compensation expense, net of income taxes	$	9,860	$	13,345	$	12,602

Stock-based compensation, allocation by financial statement line item

December 31,		2013		2012		2011
(Dollars in thousands)
Selling, general and administrative expense	$	12,933	$	18,437	$	17,538
System operations		2,911		3,029		2,645
Total stock-based compensation expense	$	15,844	$	21,466	$	20,183