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Equity Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
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 in All Other in business segment reporting were as follows (in thousands):
 
2017
 
2016
 
2015
Non-qualified stock options
$
865

 
$
745

 
$
1,228

Restricted stock and restricted stock units
4,648

 
5,039

 
2,785

Performance shares and performance share units
1,834

 
1,110

 
—

Total stock-based compensation expense
$
7,347

 
$
6,894

 
$
4,013
Schedule of Unrecognized Compensation Cost, Nonvested Awards
As of December 31, 2017, 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):
 
2017
 
2016
 
2015
Non-qualified stock options
$
2,502

 
$
175

 
$
1,059

Restricted stock and restricted stock units
7,005

 
8,740

 
9,476

Performance shares and performance share units
5,523

 
3,134

 
—

Total stock-based compensation expense
$
15,030

 
$
12,049

 
$
10,535
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes information about stock option activity for the three years ended 2017, 2016 and 2015:  
 
2017
 
Weighted
Average
Exercise
Price
 
2016
 
Weighted
Average
Exercise
Price
 
2015
 
Weighted
Average
Exercise
Price
Options outstanding at January 1
2,542,732

 
$
21.19

 
2,942,783

 
$
21.22

 
3,600,132

 
$
22.74

Granted
756,420

 
12.15

 
—

 
—

 
—

 
—

Exercised
(193,263
)
 
13.51

 
(1,250
)
 
13.82

 
(172,218
)
 
13.95

Canceled
(474,320
)
 
19.45

 
(398,801
)
 
21.47

 
(485,131
)
 
34.98

Options outstanding at December 31
2,631,569

 
$
19.44

 
2,542,732

 
$
21.19

 
2,942,783

 
$
21.22

Options exercise price range at December 31
$ 12.15 to

 
 
 
$ 13.37 to

 
 
 
$ 13.37 to

 
 
 
$
33.36

 
 
 
$
33.36

 
 
 
$
33.36

 
 
Options exercisable at December 31
2,029,773

 
 
 
2,513,614

 
 
 
2,656,983

 
 
Shares available for grant at December 31*
2,131,355

 
 
 
3,891,121

 
 
 
2,659,562

 
 
 ________________________
 *
Shares available for grant as of December 31, 2017 reduced by net restricted stock and restricted stock unit and performance share and performance share unit award activity of 2,045,888 shares and 1,999,706 shares, respectively.
Schedule of Share-based Compensation, Stock Options Outstanding
The following table summarizes information about stock options outstanding at December 31, 2017:
 
Options Outstanding
 
Options Exercisable
Exercise Prices
Number
Outstanding
At 12/31/17
 
Weighted Average
Remaining
Contractual Life Years
 
Weighted Average
Exercise Price
 
Number
Exercisable
At 12/31/17
 
Weighted Average
Exercise Price
$ 12.15 – $20.00
1,071,784

 
6.9
 
$
13.07

 
469,988

 
$
14.23

$ 20.01 – $25.00
823,501

 
2.2
 
22.21

 
823,501

 
22.21

$ 25.01 – $30.00
731,788

 
1.5
 
25.55

 
731,788

 
25.55

$ 30.01 – $33.36
4,496

 
3.4
 
33.36

 
4,496

 
33.36

Total
2,631,569

 
3.9
 
$
19.44

 
2,029,773

 
$
21.60
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The fair value of options granted is estimated on the date of grant using the Black-Scholes option-pricing model. The calculated fair value of the 2017 performance option awards was $5.38 based on the following assumptions:
 
2017
Expected dividend yield
0.4
%
Expected stock price volatility
39.1
%
Risk-free interest rate
2.31
%
Expected life in years
7.8

Forfeiture percentage
5.0
%
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
The following table summarizes information about restricted shares and restricted share units (primarily for non-U.S. recipients):
 
2017
Weighted Average Fair Value
 
2016
Weighted Average Fair Value
 
2015
Weighted Average Fair Value
Stock / Units unvested at January 1
878,356

$
15.87

 
641,505

$
18.89

 
312,423

$
17.91

Granted
523,412

12.37

 
486,711

12.62

 
480,839

19.09

Vested
(369,128
)
16.63

 
(139,298
)
17.86

 
(56,976
)
16.47

Canceled
(256,120
)
14.02

 
(110,562
)
16.60

 
(94,781
)
18.11

Stock / Units unvested at December 31
776,520

$
13.75

 
878,356

$
15.87

 
641,505

$
18.89

 
 
 
 
 
 
 
 
 
Share-based Compensation, Performance Shares Award Unvested Activity
The following table summarizes information about performance shares and performance share units (primarily for non-U.S. recipients):
 
2017
 
Weighted Average Fair Value
 
2016
 
Weighted Average Fair Value
 
2015
 
Weighted Average Fair Value
Shares / Units unvested at January 1
309,468

 
$
14.58

 
198,401

 
$
19.50

 
121,644

 
$
20.05

Granted
336,694

 
12.02

 
234,402

 
12.82

 
114,257

 
18.95

Vested
—

 
—

 
—

 
—

 
—

 
—

Canceled
(188,283
)
 
15.48

 
(123,335
)
 
19.14

 
(37,500
)
 
19.62

Shares / Units unvested at December 31
457,879

 
$
12.33

 
309,468

 
$
14.58

 
198,401

 
$
19.50