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Equity Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
There were no option awards granted during the years ended December 31, 2018, 2017 and 2016. Additional information about options outstanding and exercisable at December 31, 2018 is presented in the following table:
 
Outstanding and Exercisable Options
Range of Exercise Prices
Number of
Options
 
Weighted
Average
Remaining
Contractual
Term (in
years)
 
Aggregate
Intrinsic
Value (in
thousands)
$11.14
3,910

 
0.73
 
$
74

$15.94 - $19.97
29,145

 
1.59
 
357

$22.18 - $22.31
40,917

 
2.42
 
314

$27
888,908

 
2.08
 
2,613

$63.74
1,960

 
0.18
 
—


964,840

 
2.07
 
3,358
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
Compensation Expense Related to Equity Based Awards
The following table summarizes compensation cost related to equity based awards for the years ended December 31, 2018, 2017 and 2016 (in thousands):
 
2018
 
2017
 
2016
Compensation cost of equity based awards:
 
 
 
 
 
Unvested and restricted share awards
$
19,415

 
$
18,087

 
$
16,885

Executive share-based awards
3,027

 
3,416

 
1,482

Incentive awards
798

 
1,289

 
—

Total compensation cost of equity based awards
23,240

 
22,792

 
18,367

Related tax benefits
(5,783
)
 
(8,576
)
 
(6,899
)
Compensation cost of equity based awards, net of tax
$
17,457

 
$
14,216

 
$
11,468
Schedule of Other Share-based Compensation, Activity [Table Text Block]
A summary of activity related to executive share-based awards for the years ended December 31, 2018, 2017 and 2016 follows:
 
RSU
 
PSU
Unvested executive share-based awards outstanding, December 31, 2015
—

 
—

Granted
97,852

 
57,873

Vested
(19,291
)
 
—

Unvested executive share-based awards outstanding, December 31, 2016
78,561

 
57,873

Granted
47,848

 
47,848

Vested
(35,238
)
 
—

Unvested executive share-based awards outstanding, December 31, 2017
91,171

 
105,721

Granted
52,026

 
52,026

Vested
(52,585
)
 
(57,873
)
Unvested executive share-based awards outstanding, December 31, 2018
90,612

 
99,874

The total liability for the share units was $5.5 million at December 31, 2018. The total unrecognized compensation cost of $3.9 million for these share units at December 31, 2018 will be recognized over a weighted average remaining period of 1.78 years.
Share-based Compensation, Stock Options, Activity [Table Text Block]
Note 13    Equity Based and Other Compensation Plans
Description of Equity Based Compensation Plans
In connection with the IPO of the Company's common stock in 2011, the Company adopted the 2010 Plan. In 2014, the Board of Directors and the Company's stockholders approved the 2014 Plan. The 2010 Plan and 2014 Plans are administered by the Board of Directors or a committee thereof and provide for the grant of non-qualified stock options, SARs, restricted shares, deferred shares, performance shares, unrestricted shares and other share-based awards to selected employees, directors or independent contractors of the Company and its affiliates. The number of shares of common stock authorized for award under the 2010 Plan is 7,500,000, of which 118,847 shares remain available for issuance as of December 31, 2018. The number of shares of common stock available for issuance under the 2014 Plan is 4,000,000, of which 2,061,087 shares remain available for issuance as of December 31, 2018. Shares of common stock delivered under the plans may consist of authorized but unissued shares or previously issued shares reacquired by the Company. The term of a share option or SAR issued under the plans may not exceed ten years from the date of grant and the exercise price may not be less than the fair market value of the Company's common stock at the date of grant. Unvested awards generally become fully vested in the event of a change in control, as defined.
Compensation Expense Related to Equity Based Awards
The following table summarizes compensation cost related to equity based awards for the years ended December 31, 2018, 2017 and 2016 (in thousands):
 
2018
 
2017
 
2016
Compensation cost of equity based awards:
 
 
 
 
 
Unvested and restricted share awards
$
19,415

 
$
18,087

 
$
16,885

Executive share-based awards
3,027

 
3,416

 
1,482

Incentive awards
798

 
1,289

 
—

Total compensation cost of equity based awards
23,240

 
22,792

 
18,367

Related tax benefits
(5,783
)
 
(8,576
)
 
(6,899
)
Compensation cost of equity based awards, net of tax
$
17,457

 
$
14,216

 
$
11,468


Share Awards
Unvested share awards
A summary of activity related to unvested share awards follows for the years ended December 31, 2018, 2017 and 2016 follows:
 
Number of Share Awards
 
Weighted Average Grant Date Fair Value
Unvested share awards outstanding, December 31, 2015
1,040,385

 
$
31.86

Granted
651,760

 
31.00

Vested
(428,167
)
 
31.79

Canceled or forfeited
(143,278
)
 
31.31

Unvested share awards outstanding, December 31, 2016
1,120,700

 
31.46

Granted
621,806

 
40.24

Vested
(553,007
)
 
31.67

Canceled or forfeited
(81,022
)
 
34.51

Unvested share awards outstanding, December 31, 2017
1,108,477

 
36.06

Granted
683,137

 
40.06

Vested
(532,662
)
 
34.64

Canceled or forfeited
(72,714
)
 
38.43

Unvested share awards outstanding, December 31, 2018
1,186,238

 
$
38.86

Unvested share awards are generally valued at the closing price of the Company's common stock on the date of grant. All of the shares vest in equal annual installments over a period of three years from the date of grant. The following table summarizes the range of the closing price of the Company's stock on the date of grant for shares granted and the aggregate grant date fair value of shares vesting for the years ended December 31, 2018, 2017 and 2016 (in thousands, except per share data):
 
2018
 
2017
 
2016
Range of the closing price on date of grant
$33.44 - $42.8
 
$33.21 - $40.84
 
$29.78 - $33.76
Aggregate grant date fair value of shares vesting
$
18,451

 
$
17,514

 
$
13,613

The total unrecognized compensation cost of $26.5 million for all unvested share awards outstanding at December 31, 2018 will be recognized over a weighted average remaining period of 1.70 years.
Executive share-based awards
Certain of the Company's executives are eligible to receive annual awards of RSUs and PSUs (collectively, the "share units"). Annual awards of RSUs represent a fixed number of shares and vest on December 31st in equal tranches over three years. PSUs are initially granted based on a target value. The number of PSUs that ultimately vest at the end of a three-year performance measurement period will be based on the achievement of performance criteria pre-established by the Compensation Committee of the Board of Directors. The performance criteria established for the PSUs granted in 2018, 2017 and 2016 include both performance and market conditions. Upon vesting, the share units will be converted to common stock on a one-for-one basis, or may be settled in cash at the Company's option. The share units will accumulate dividends declared on the Company's common stock from the date of grant to be paid subsequent to vesting.
The Company has cash settled all tranches of RSUs that have vested through December 31, 2017. RSUs vested on December 31, 2018 have not yet settled. As a result of the previous cash settlements, all RSUs and PSUs have been determined to be liability instruments and are remeasured at fair value each reporting period until the awards are settled. The RSUs are valued based on the closing price of the Company's common stock at the reporting date. The PSUs are valued based on the closing price of the Company's common stock at the reporting date net of a discount related to any applicable market conditions, considering the probability of meeting the defined performance conditions. Compensation cost related to PSUs is recognized during the performance period based on the probable outcome of the respective performance conditions.
A summary of activity related to executive share-based awards for the years ended December 31, 2018, 2017 and 2016 follows:
 
RSU
 
PSU
Unvested executive share-based awards outstanding, December 31, 2015
—

 
—

Granted
97,852

 
57,873

Vested
(19,291
)
 
—

Unvested executive share-based awards outstanding, December 31, 2016
78,561

 
57,873

Granted
47,848

 
47,848

Vested
(35,238
)
 
—

Unvested executive share-based awards outstanding, December 31, 2017
91,171

 
105,721

Granted
52,026

 
52,026

Vested
(52,585
)
 
(57,873
)
Unvested executive share-based awards outstanding, December 31, 2018
90,612

 
99,874

The total liability for the share units was $5.5 million at December 31, 2018. The total unrecognized compensation cost of $3.9 million for these share units at December 31, 2018 will be recognized over a weighted average remaining period of 1.78 years.
Incentive awards
The Company's annual incentive compensation arrangements for employees other than those eligible for the executive share-based awards discussed above provide for settlement through a combination of cash payments and unvested share awards following the end of the annual performance period. The dollar value of share awards to be granted is based on the achievement of performance criteria established in the incentive arrangements. The number of shares of common stock to be awarded is variable based on the closing price of the Company's stock on the date of grant; therefore, these awards are initially classified as liability instruments, with compensation cost recognized from the beginning of the performance period. The awards vest in equal installments over a period of three years from the date of grant. The total liability for incentive share awards was $0.8 million at December 31, 2018. The total unrecognized compensation cost of $2.3 million for incentive share awards at December 31, 2018 will be recognized over a weighted average remaining period of 3.00 years. The accrued liability and unrecognized compensation cost are based on management's current estimate of the likely outcome of the performance criteria established in the incentive arrangements and may differ from actual results.
The 683,137 unvested share awards granted during the year ended December 31, 2018, as discussed above, included 77,050 unvested share awards granted under the Company's annual incentive compensation arrangements based on the achievement of established performance criteria for the year ended December 31, 2017.
Option Awards
A summary of activity related to stock option awards for the years ended December 31, 2018, 2017 and 2016 follows:
 
Number of
Option
Awards
 
Weighted
Average
Exercise Price
Option awards outstanding, December 31, 2015
3,651,152

 
$
26.62

Exercised
(47,979
)
 
16.50

Canceled or forfeited
(1,097
)
 
63.74

Option awards outstanding, December 31, 2016
3,602,076

 
26.74

Exercised
(2,331,388
)
 
26.63

Option awards outstanding, December 31, 2017
1,270,688

 
26.93

Exercised
(291,689
)
 
26.49

Canceled or forfeited
(14,159
)
 
11.14

Option awards outstanding and exercisable, December 31, 2018
964,840

 
$
27.30

The intrinsic value of options exercised during the years ended December 31, 2018, 2017 and 2016 was $4.6 million, $25.8 million and $0.9 million, respectively. The related tax benefit of options exercised was $1.1 million, $4.0 million and $0.3 million, respectively, during the years ended December 31, 2018, 2017 and 2016.
Schedule of Nonvested Share Activity [Table Text Block]
A summary of activity related to unvested share awards follows for the years ended December 31, 2018, 2017 and 2016 follows:
 
Number of Share Awards
 
Weighted Average Grant Date Fair Value
Unvested share awards outstanding, December 31, 2015
1,040,385

 
$
31.86

Granted
651,760

 
31.00

Vested
(428,167
)
 
31.79

Canceled or forfeited
(143,278
)
 
31.31

Unvested share awards outstanding, December 31, 2016
1,120,700

 
31.46

Granted
621,806

 
40.24

Vested
(553,007
)
 
31.67

Canceled or forfeited
(81,022
)
 
34.51

Unvested share awards outstanding, December 31, 2017
1,108,477

 
36.06

Granted
683,137

 
40.06

Vested
(532,662
)
 
34.64

Canceled or forfeited
(72,714
)
 
38.43

Unvested share awards outstanding, December 31, 2018
1,186,238

 
$
38.86

Unvested share awards are generally valued at the closing price of the Company's common stock on the date of grant. All of the shares vest in equal annual installments over a period of three years from the date of grant. The following table summarizes the range of the closing price of the Company's stock on the date of grant for shares granted and the aggregate grant date fair value of shares vesting for the years ended December 31, 2018, 2017 and 2016 (in thousands, except per share data):
 
2018
 
2017
 
2016
Range of the closing price on date of grant
$33.44 - $42.8
 
$33.21 - $40.84
 
$29.78 - $33.76
Aggregate grant date fair value of shares vesting
$
18,451

 
$
17,514

 
$
13,613

The total unrecognized compensation cost of $26.5 million for all unvested share awards outstanding at December 31, 2018 will be recognized over a weighted average remaining period of 1.70 years.