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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The following table summarizes the Company's non-vested restricted stock units activity as of December 31, 2017 and changes during the year then ended: 
 
 
Shares
 
Weighted Average
Grant Date
Fair Value
Non-vested at beginning of year
 
62,701

 
$
65.35

Granted
 
28,668

 
$
73.18

Vested
 
(26,170
)
 
$
70.03

Forfeited
 
(10,361
)
 
$
67.95

Non-vested at end of year
 
54,838

 
$
66.72
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
The following table summarizes the Company's non-vested restricted stock activity as of December 31, 2017 and changes during the year then ended: 
 
 
Shares
 
Weighted Average
Grant Date
Fair Value
Non-vested at beginning of year
 
266,370

 
$
64.76

Granted
 
106,799

 
$
73.07

Vested
 
(67,806
)
 
$
78.33

Forfeited
 
(16,347
)
 
$
63.07

Non-vested at end of year
 
289,016

 
$
64.74
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The following weighted average assumptions were used to estimate the grant date fair value of options granted during the years ended December 31, 2017, 2016 and 2015 using the Black-Scholes option pricing model: 
 
 
2017
 
2016
 
2015
Expected volatility
 
30
%
 
37
%
 
27
%
Expected term (in years)
 
4

 
4

 
4

Risk-free interest rate
 
1.69
%
 
1.08
%
 
1.31
%
Expected dividend yield
 
0
%
 
0
%
 
0
%
Schedule of Share-based Compensation, Stock Options, Activity
A summary of option activity under the Omnibus Plan as of December 31, 2017 and changes during the year then ended is presented below: 
 
 
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual Term
(in years)
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at beginning of year
 
1,357,498

 
$
77.12

 
 
 
 
Granted
 
362,903

 
73.98

 
 
 
 
Exercised
 
(167,663
)
 
61.44

 
 
 
 
Expired
 
(33,240
)
 
90.47

 
 
 
 
Forfeited
 
(41,872
)
 
69.57

 
 
 
 
Outstanding at end of year
 
1,477,626

 
$
78.04

 
2.6
 
$
10,811

Exercisable at end of year
 
789,818

 
$
85.88

 
1.8
 
$
3,503
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
STOCK-BASED COMPENSATION PLANS:
The Omnibus Plan allows for the issuance of up to 7,437,500 shares of Class A Common Stock for awards, which include stock options, restricted stock, restricted stock units and any other form of award established by the Compensation Committee, in each case consistent with the plan's purpose. Stock-based awards generally have three-year requisite service periods and five-year contractual terms. Any shares of common stock related to awards that terminate by expiration, forfeiture or cancellation are deemed available for issuance or reissuance under the Omnibus Plan. In total, at December 31, 2017, there remained 1,492,088 shares of Class A Common Stock available for future issuance under the Omnibus Plan.
A summary of option activity under the Omnibus Plan as of December 31, 2017 and changes during the year then ended is presented below: 
 
 
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual Term
(in years)
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at beginning of year
 
1,357,498

 
$
77.12

 
 
 
 
Granted
 
362,903

 
73.98

 
 
 
 
Exercised
 
(167,663
)
 
61.44

 
 
 
 
Expired
 
(33,240
)
 
90.47

 
 
 
 
Forfeited
 
(41,872
)
 
69.57

 
 
 
 
Outstanding at end of year
 
1,477,626

 
$
78.04

 
2.6
 
$
10,811

Exercisable at end of year
 
789,818

 
$
85.88

 
1.8
 
$
3,503


The weighted average grant date fair value of options granted during the years ended December 31, 2017, 2016 and 2015 was $19.38, $17.37 and $18.47, respectively. The total intrinsic value of options exercised during the years ended December 31, 2017, 2016 and 2015 was $1.5 million, $1.6 million and $4.7 million, respectively.
The Company determines the fair value of each option award on the date of grant using the Black-Scholes option pricing model. There are six input variables to the Black-Scholes model: stock price, strike price, volatility, term, risk-free interest rate and dividend yield. Both the stock price and strike price inputs are typically the closing stock price on the date of grant. The assumption for expected future volatility is based on a combination of historical and implied volatility of the Company's Class A Common Stock. The expected term of options is derived from the vesting period of the award, as well as historical exercise data, and represents the period of time that options granted are expected to be outstanding. The expected risk-free rate is calculated using the United States Treasury yield curve over the expected term of the option. The expected dividend yield is 0% for all periods presented, based upon the Company's historical practice of not paying cash dividends on its common stock.
The following weighted average assumptions were used to estimate the grant date fair value of options granted during the years ended December 31, 2017, 2016 and 2015 using the Black-Scholes option pricing model: 
 
 
2017
 
2016
 
2015
Expected volatility
 
30
%
 
37
%
 
27
%
Expected term (in years)
 
4

 
4

 
4

Risk-free interest rate
 
1.69
%
 
1.08
%
 
1.31
%
Expected dividend yield
 
0
%
 
0
%
 
0
%

The Company determines fair value of its restricted stock and restricted stock units based on the closing stock price on the date of grant.
The following table summarizes the Company's non-vested restricted stock activity as of December 31, 2017 and changes during the year then ended: 
 
 
Shares
 
Weighted Average
Grant Date
Fair Value
Non-vested at beginning of year
 
266,370

 
$
64.76

Granted
 
106,799

 
$
73.07

Vested
 
(67,806
)
 
$
78.33

Forfeited
 
(16,347
)
 
$
63.07

Non-vested at end of year
 
289,016

 
$
64.74


The weighted average grant date fair value of restricted stock granted during the years ended December 31, 2017, 2016 and 2015 was $73.07, $57.11 and $79.30, respectively. The total grant date fair value of restricted stock that vested during the years ended December 31, 2017, 2016 and 2015 was $5.3 million, $6.5 million and $5.2 million, respectively.
The following table summarizes the Company's non-vested restricted stock units activity as of December 31, 2017 and changes during the year then ended: 
 
 
Shares
 
Weighted Average
Grant Date
Fair Value
Non-vested at beginning of year
 
62,701

 
$
65.35

Granted
 
28,668

 
$
73.18

Vested
 
(26,170
)
 
$
70.03

Forfeited
 
(10,361
)
 
$
67.95

Non-vested at end of year
 
54,838

 
$
66.72


The weighted average grant date fair value of restricted stock units granted during the years ended December 31, 2017, 2016 and 2015 was $73.18, $57.11 and $70.64, respectively. The total grant date fair value of restricted stock units that vested during the years ended December 31, 2017, 2016 and 2015 was $1.8 million, $1.8 million and $4.2 million, respectively.
In February 2016, the Company's Compensation Committee approved new performance-based restricted stock units under the Omnibus Plan. The performance-based restricted stock units are granted once per year and vest on the first anniversary of the grant date with the payout performance multiplier (ranging from 0% to 200%) to be determined in accordance with the Company’s attainment of pre-determined financial performance targets established under the Company’s Genesee Value Added (GVA) methodology. These awards have a service condition and performance condition.
The following table summarizes the 2017 and 2016 performance-based restricted stock unit activity as of December 31, 2017 and changes during the year then ended. Actual shares that will be paid out for the 2017 award depends on the level of attainment of the performance based criteria. As of December 31, 2017, the Company expects to pay out 77% of the 2017 award. The Company paid out 100% of the 2016 award during 2017.
 
 
Shares
 
Weighted Average
Grant Date
Fair Value
Non-vested at beginning of year
 
27,602

 
$
57.12

Granted
 
32,669

 
$
74.14

Vested
 
(27,602
)
 
$
57.12

Forfeited
 
(1,058
)
 
$
74.14

Non-vested at end of year
 
31,611

 
$
74.14


The Company determined the fair value of each of the 2017 and 2016 performance-based restricted stock units by multiplying the number of units expected to be earned by the grant date fair market value of a share of the Company's Class A Common Stock. Each reporting period, the number of performance-based restricted stock units that are expected to be earned is determined and compensation cost based on the grant date fair value is adjusted based on the current period probability assessment. At the end of the requisite service period, compensation cost is adjusted to equal the restricted stock units actually issued multiplied by the grant date fair value.
In 2015 and 2014, the Company's Compensation Committee awarded performance-based restricted stock units under the Omnibus Plan. These performance-based restricted stock units were granted once per year and vested based upon the achievement of market performance criteria, ranging from 0% to 100%, as determined by the Compensation Committee prior to the date of the award, and continued service during the performance period. The performance period for these awards was generally three years. These performance-based restricted stock units entitled the grantee to receive shares of Class A Common Stock based upon the Company's Relative Total Shareholder Return as independently ranked against the components of the S&P 500 Index and the custom peer group over the performance period with each discrete half of the award's payouts being measured independently and then averaged together to find the final payout. The expense for these awards is recognized over the service period, even if the market condition is never satisfied. As a result of the Compensation Committee's recent modification to the Long-Term Incentive Compensation Program, including adoption of a new-performance based restricted stock unit program, effective February 2016, this program was discontinued and no future awards will be granted.
The following table summarizes the 2015 and 2014 performance-based restricted stock units activity as of December 31, 2017 and changes during the year then ended. Actual shares that have vested or will vest depend on the level of attainment of the performance based criteria. As of December 31, 2017, the threshold performance for any payout on the 2015 awards granted has not been met. Based on the market condition criteria for the 2014 performance-based restricted stock units awarded, no shares were paid out at February 1, 2017 (the end of the performance period).
 
 
Shares
 
Weighted Average
Grant Date
Fair Value
Non-vested at beginning of year
 
28,810

 
$
52.55

Granted
 
—

 
$
—

Vested
 
—

 
$
—

Forfeited/Canceled
 
(14,424
)
 
$
42.39

Non-vested at end of year
 
14,386

 
$
62.73


The following table presents the total compensation costs, total income tax benefit recognized in the consolidated statement of operations for stock-based awards and total tax benefit realized from exercise of stock-based awards for the years ended December 31, 2017, 2016 and 2015 (dollars in thousands):
 
 
2017
 
2016
 
2015
Compensation costs
 
$
17,477

 
$
17,888

 
$
14,301

Income tax benefit recognized for compensation costs
 
$
4,908

 
$
4,578

 
$
4,186

Income tax benefit realized from exercise of stock-based awards
 
$
2,546

 
$
2,214

 
$
4,079


The total compensation costs related to non-vested awards not yet recognized was $21.1 million as of December 31, 2017, which will be recognized over the next three years with a weighted average period of 1.6 years.
The Company has reserved 1,265,625 shares of Class A Common Stock that the Company may sell to its full-time employees under its Employee Stock Purchase Plan (ESPP) at 90% of the stock's market price on the date of purchase. At December 31, 2017, 278,230 shares had been purchased under this plan. The Company recorded compensation expense for the 10% purchase discount of less than $0.2 million in each of the years ended December 31, 2017, 2016 and 2015.
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
The following table presents the total compensation costs, total income tax benefit recognized in the consolidated statement of operations for stock-based awards and total tax benefit realized from exercise of stock-based awards for the years ended December 31, 2017, 2016 and 2015 (dollars in thousands):
 
 
2017
 
2016
 
2015
Compensation costs
 
$
17,477

 
$
17,888

 
$
14,301

Income tax benefit recognized for compensation costs
 
$
4,908

 
$
4,578

 
$
4,186

Income tax benefit realized from exercise of stock-based awards
 
$
2,546

 
$
2,214

 
$
4,079
Performance Shares Current Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation, Performance Shares Award Unvested Activity
The following table summarizes the 2017 and 2016 performance-based restricted stock unit activity as of December 31, 2017 and changes during the year then ended. Actual shares that will be paid out for the 2017 award depends on the level of attainment of the performance based criteria. As of December 31, 2017, the Company expects to pay out 77% of the 2017 award. The Company paid out 100% of the 2016 award during 2017.
 
 
Shares
 
Weighted Average
Grant Date
Fair Value
Non-vested at beginning of year
 
27,602

 
$
57.12

Granted
 
32,669

 
$
74.14

Vested
 
(27,602
)
 
$
57.12

Forfeited
 
(1,058
)
 
$
74.14

Non-vested at end of year
 
31,611

 
$
74.14
Performance Shares - 2015 & 2014 Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation, Performance Shares Award Unvested Activity
The following table summarizes the 2015 and 2014 performance-based restricted stock units activity as of December 31, 2017 and changes during the year then ended. Actual shares that have vested or will vest depend on the level of attainment of the performance based criteria. As of December 31, 2017, the threshold performance for any payout on the 2015 awards granted has not been met. Based on the market condition criteria for the 2014 performance-based restricted stock units awarded, no shares were paid out at February 1, 2017 (the end of the performance period).
 
 
Shares
 
Weighted Average
Grant Date
Fair Value
Non-vested at beginning of year
 
28,810

 
$
52.55

Granted
 
—

 
$
—

Vested
 
—

 
$
—

Forfeited/Canceled
 
(14,424
)
 
$
42.39

Non-vested at end of year
 
14,386

 
$
62.73