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Long-term Equity-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The assumptions used in the Black-Scholes pricing model for Tandem Awards granted during the years ended December 31, 2017, 2016 and 2015 are presented below.
|  | 2017 |  | 2016 |  | 2015
RANGE OF VALUATION ASSUMPTIONS |  |  |  |  |  |  |  |  |  |  |  |
Expected Volatility |  | 26.17 | % | - | 30.39 | % |  | 25.85 | % | - | 42.19 | % |  | 21.31 | % | - | 41.65 | %
Risk-free Interest Rate |  | 1.59 |  | - | 2.25 |  |  | 0.77 |  | - | 2.01 |  |  | 1.08 |  | - | 1.96 |
Expected Dividend Yield |  | 1.39 |  | - | 2.43 |  |  | 2.22 |  | - | 3.41 |  |  | 2.37 |  | - | 2.62 |
WEIGHTED-AVERAGE EXPECTED LIFE IN YEARS |  |  |  |  |  |  |  |  |  |  |  |
Employee Grants |  | 4 |  | - | 6.5 |  | 1 |  | - | 6.5 |  | 4 |  | - | 7
Director Grants |  | N/A |  | N/A |  | 5.5
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award | activity for the year ended December 31, 2017 is presented below.
|  | Shares Subject to Awards |  | Weighted- average Exercise Price Per Share ($) |  | Weighted- average Remaining Contractual Life (in Years) |  | Aggregate Intrinsic Value ($ In Millions)
Outstanding at Beginning of the Year |  | 1,306,123 |  |  | $ | 36.35 |  |  |  |  |
Granted |  | 444,339 |  |  | 43.72 |  |  |  |  |
Exercised |  | (377,811 | ) |  | 35.60 |  |  |  |  |
Forfeited or Expired |  | (360,372 | ) |  | 43.14 |  |  |  |  |
Outstanding at December 31, 2017 |  | 1,012,279 |  |  | 37.45 |  |  | 7.85 |  | $ | 31.8 |
Vested and Expected to Vest at December 31, 2017 |  | 959,899 |  |  | $ | 37.40 |  |  | 7.81 |  | $ | 30.2 |
Exercisable at December 31, 2017 |  | 470,946 |  |  | $ | 35.49 |  |  | 6.92 |  | $ | 15.7 |
Schedule of Options Outstanding | Information pertaining to Tandem Awards outstanding at December 31, 2017 is presented below.
|  |  |  | Outstanding |  | Exercisable
Range of Exercise Prices ($) |  | Shares Subject to Awards |  | Weighted- average Exercise Price Per Share ($) |  | Weighted- average Remaining Contractual Life (in Years) |  | Shares Subject to Awards |  | Weighted- average Exercise Price Per Share ($)
$ | 15.00 |  | - | $ | 20.00 |  |  | 4,000 |  |  | $ | 16.48 |  |  | 1.35 |  | 4,000 |  |  | $ | 16.48 |
20.01 |  | - | 25.00 |  |  | 2,000 |  |  | 22.33 |  |  | 1.94 |  | 2,000 |  |  | 22.33 |
25.01 |  | - | 30.00 |  |  | 205,469 |  |  | 27.82 |  |  | 7.36 |  | 108,813 |  |  | 27.92 |
30.01 |  | - | 35.00 |  |  | 124,127 |  |  | 31.84 |  |  | 6.90 |  | 83,141 |  |  | 32.03 |
35.01 |  | - | 40.00 |  |  | 198,515 |  |  | 37.40 |  |  | 7.03 |  | 124,428 |  |  | 37.20 |
40.01 |  | - | 45.00 |  |  | 463,637 |  |  | 42.58 |  |  | 8.70 |  | 148,564 |  |  | 42.24 |
45.01 |  | - | 50.00 |  |  | — |  |  | — |  |  | 0.00 |  | — |  |  | — |
50.01 |  | - | 55.00 |  |  | 734 |  |  | 54.50 |  |  | 9.76 |  | — |  |  | — |
55.01 |  | - | 60.00 |  |  | — |  |  | — |  |  | 0.00 |  | — |  |  | — |
60.01 |  | - | 65.00 |  |  | 6,221 |  |  | 64.30 |  |  | 9.84 |  | — |  |  | — |
65.01 |  |  | 70.00 |  |  | 7,576 |  |  | 68.65 |  |  | 9.92 |  | — |  |  | — |
15.00 |  | - | 70.00 |  |  | 1,012,279 |  |  | 37.45 |  |  | 7.85 |  | 470,946 |  |  | 35.49 |
Schedule of Share-based Compensation, Nonemployee Director Deferred Stock Unit Award Plan, Activity [Table Text Block] | Activity related to DSU awards for the year ended December 31, 2017 is presented below.
|  | Number of DSUs |  | Weighted- average Grant-date Fair Value Per DSU
Vested Balance at Beginning of the Year |  | 21,520 |  |  | $ | 32.68 |
Granted and Vested |  | 23,040 |  |  | 38.20 |
Vested Balance at December 31, 2017 |  | 44,560 |  |  | $ | 35.54 |
Time Vested Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity | Activity related to nonvested RSUs for the year ended December 31, 2017 is presented below.
| Time-based Restricted Stock Awards |  | Time-based Restricted Stock Unit Awards
| Number of Shares |  | Weighted- average Grant-date Fair Value Per Share |  | Number of Restricted Stock Units |  | Weighted- average Grant-date Fair Value Per Unit
Nonvested Balance at Beginning of the Year | 16,000 |  |  | $ | 34.69 |  |  | 158,361 |  |  | $ | 33.56 |
Granted | — |  |  | — |  |  | 84,331 |  |  | 44.70 |
Vested | (14,000 | ) |  | 34.13 |  |  | (57,016 | ) |  | 33.65 |
Forfeited | (2,000 | ) |  | 38.59 |  |  | (55,429 | ) |  | 34.46 |
Nonvested Balance at December 31, 2017 | — |  |  | $ | — |  |  | 130,247 |  |  | $ | 40.34 |
Performance Based Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity | Activity related to nonvested PSU awards for the year ended December 31, 2017 is presented below.
| PSU Awards
| Number of PSUs |  | Weighted- average Grant-date Fair Value Per PSU
Nonvested Balance at Beginning of the Year | 227,584 |  |  | $ | 34.55 |
Granted | 100,620 |  |  | 44.32 |
Forfeited | (102,221 | ) |  | 38.96 |
Nonvested Balance at December 31, 2017 | 225,983 |  |  | $ | 36.90 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for deferred stock unit awards granted to nonemployee directors that were outstanding at the beginning and end of the year, and the number of awards that were granted, exercised or converted, forfeited, and expired during the year. + References No definition available. + Details
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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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