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Equity Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
The amounts of equity-based compensation expense recognized as part of selling, general and administrative expenses were as follows (in thousands):
 
2015
 
2014
 
2013
Non-Qualified stock options
$
1,228

 
$
3,356

 
$
3,926

Restricted stock and restricted stock units
2,785

 
2,270

 
2,031

Performance shares and performance share units
—

 
—

 
—

Total stock-based compensation expense
$
4,013

 
$
5,626

 
$
5,957
Schedule of Unrecognized Compensation Cost, Nonvested Awards
As of December 31, 2015, unrecognized compensation expense related to equity-based compensation arrangements granted under the company's 2013 Plan and previous plans, which is related to non-vested options and shares, was as follows (in thousands):
 
2015
 
2014
 
2013
Non-Qualified stock options
$
1,059

 
$
2,600

 
$
8,270

Restricted stock and restricted stock units
9,476

 
4,461

 
3,705

Performance shares and performance share units
—

 
—

 
—

Total stock-based compensation expense
$
10,535

 
$
7,061

 
$
11,975
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes information about stock option activity for the three years ended 2015, 2014 and 2013:  
 
2015
 
Weighted
Average
Exercise
Price
 
2014
 
Weighted
Average
Exercise
Price
 
2013
 
Weighted
Average
Exercise
Price
Options outstanding at January 1
3,600,132

 
$
22.74

 
4,533,782

 
$
23.86

 
4,664,634

 
$
26.21

Granted
—

 
0.00

 
8,977

 
16.71

 
756,700

 
14.47

Exercised
(172,218
)
 
13.95

 
(33,810
)
 
14.16

 
(30,166
)
 
16.94

Canceled
(485,131
)
 
34.98

 
(908,817
)
 
28.57

 
(857,386
)
 
28.63

Options outstanding at December 31
2,942,783

 
$
21.22

 
3,600,132

 
$
22.74

 
4,533,782

 
$
23.86

Options exercise price range at December 31
$ 13.37 to

 
 
 
$ 13.37 to

 
 
 
$ 13.35 to

 
 
 
$
33.36

 
 
 
$
47.80

 
 
 
$
47.80

 
 
Options exercisable at December 31
2,656,983

 
 
 
2,954,082

 
 
 
2,985,175

 
 
Shares available for grant at December 31*
2,659,562

 
 
 
3,654,426

 
 
 
4,460,337

 
 

 ________________________
 *
Shares available for grant as of December 31, 2015 reduced by net restricted stock / unit and performance share / unit award activity of 1,110,740 shares and 681,058 shares, respectively.
Schedule of Share-based Compensation, Stock Options Outstanding
The following table summarizes information about stock options outstanding at December 31, 2015:
 
Options Outstanding
 
Options Exercisable
Exercise Prices
Number
Outstanding
At 12/31/15
 
Weighted Average
Remaining
Contractual Life Years
 
Weighted Average
Exercise Price
 
Number
Exercisable
At 12/31/15
 
Weighted Average
Exercise Price
$ 13.37 – $20.00
778,159

 
6.7
 
$
14.12

 
493,671

 
$
14.11

$ 20.01 – $25.00
1,353,578

 
3.3
 
22.59

 
1,353,578

 
22.59

$ 25.01 – $30.00
783,738

 
3.7
 
25.55

 
783,738

 
25.55

$ 30.01 – $33.36
27,308

 
1.0
 
31.74

 
25,996

 
31.73

Total
2,942,783

 
4.3
 
$
21.22

 
2,656,983

 
$
21.98
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions for awards granted in 2014 and 2013 as no options were granted in 2015:
 
2014
 
2013
Expected dividend yield
0.3
%
 
0.4
%
Expected stock price volatility
36.8
%
 
38.2
%
Risk-free interest rate
1.76
%
 
0.82
%
Expected life in years
6.1

 
6.1

Forfeiture percentage
13.0
%
 
9.2
%
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
The following table summarizes information about restricted shares and restricted share units (for non-U.S. recipients):
 
2015
Weighted Average Fair Value
 
2014
Weighted Average Fair Value
 
2013
Weighted Average Fair Value
Stock / Units unvested at January 1
312,423

$
17.91

 
264,878

$
16.69

 
260,548

$
19.15

Granted
480,839

19.09

 
218,276

19.36

 
114,700

14.49

Vested
(56,976
)
16.47

 
(93,140
)
17.62

 
(97,445
)
20.33

Canceled
(94,781
)
18.11

 
(77,591
)
17.58

 
(12,925
)
19.23

Stock / Units unvested at December 31
641,505

$
18.89

 
312,423

$
17.91

 
264,878

$
16.69

 
 
 
 
 
 
 
 
 
Share-based Compensation, Performance Shares Award Unvested Activity
The following table summarizes information about performance shares and performance share units (for non-U.S. recipients):
 
2015
 
Weighted Average Fair Value
 
2014
 
Weighted Average Fair Value
Shares / Units unvested at January 1
121,644

 
$
20.05

 
—

 
$
—

Granted
114,257

 
18.95

 
152,800

 
20.05

Vested
—

 
—

 
—

 
—

Canceled
(37,500
)
 
19.62

 
(31,156
)
 
20.05

Shares / Units unvested at December 31
198,401

 
$
19.50

 
121,644

 
$
20.05