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Equity Incentive Program (Tables)
 6 Months Ended
Jun. 30, 2017
Share-based Compensation [Abstract]  
Schedule of Black-Scholes Option-Pricing Assumptions
The expense related to stock options granted in the six months ended June 30, 2017 and 2016 was estimated on the date of grant using a Black-Scholes option-pricing model based on the assumptions shown in the table below.
 
Six Months Ended June 30,
 
2017
 
2016
Risk-free interest rate
1.73%
to
1.93%
 
1.04%
to
1.12%
Dividend yield
—%
 
—%
Expected life (years)
4.5
 
4.5
Volatility
38.1%
to
38.8%
 
37.0%
to
39.6%
Fair value at date of grant
$6.07
to
$6.73
 
$3.76
to
$4.27
Schedule of SSAR and Stock Options Activity
The following table summarizes the Company's stock-settled stock appreciation right ("SSAR") and stock option activity for the six months ended June 30, 2017 (in millions except share and per share amounts).
 
SSARs
 
Stock Options
 
Number of Shares
 
Weighted-Average Exercise Price
 
Aggregate Intrinsic Value
 
Weighted-Average Remaining Contractual Term (Years)
 
Number of Shares
 
Weighted-Average Exercise Price
 
Aggregate Intrinsic Value
 
Weighted-Average Remaining Contractual Term (Years)
Outstanding at December 31, 2016
898,718

 
$
21.25

 
 
 
 
 
4,684,117

 
$
18.03

 
 
 
 
Granted
—

 
—

 
 
 
 
 
779,561

 
19.21

 
 
 
 
Exercised
(31,665
)
 
12.33

 
 
 
 
 
(218,389
)
 
14.49

 
 
 
 
Forfeited
—

 
—

 
 
 
 
 
(223,893
)
 
15.35

 
 
 
 
Expired
(16,537
)
 
23.20

 
 
 
 
 
(54,982
)
 
26.77

 
 
 
 
Outstanding at June 30, 2017
850,516

 
$
21.54

 
$
0.3

 
4.5
 
4,966,414

 
$
18.38

 
$
9.6

 
5.2
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exercisable at June 30, 2017
850,516

 
$
21.54

 
$
0.3

 
4.5
 
2,213,679

 
$
20.53

 
$
2.9

 
4.6
Schedule of Restricted Stock Units Award Activity
The following table summarizes the Company's restricted stock unit ("RSU") balances for the six months ended June 30, 2017.
 
Share units
 
Weighted-average grant date fair value
Unvested at December 31, 2016
2,074,998

 
$
14.94

Granted
1,200,457

 
19.14

Vested
(709,951
)
 
16.03

Forfeited
(294,511
)
 
15.70

Unvested at June 30, 2017
2,270,993

 
$
16.70



At June 30, 2017, $30.6 million of unrecognized compensation expense related to RSUs is expected to be recognized over a weighted-average period of 1.5 years.
Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block]
 
Share units
 
Weighted-average grant date fair value
Unvested at December 31, 2016
—

 
$
—

Granted
171,875

 
15.40

Vested
—

 
—

Forfeited
—

 
—

Unvested at June 30, 2017
171,875

 
$
15.40