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Long-term Equity-based Compensation Plans (Tables) | 3 Months Ended
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Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The assumptions used in the Black-Scholes pricing model for Tandem Awards granted during the three months ended March 31, 2016 and 2015 were as follows:
| Three Months Ended
| Mar 31, 2016 |  | Mar 31, 2015
Range of Valuation Assumptions |  |  |  |  |  |  |
Expected Volatility | 25.85 | % | - | 27.82 | % |  | 22.49 | % | - | 41.65 | %
Risk-free Interest Rate | 1.15 |  | - | 1.55 |  |  | 1.08 |  | - | 1.63 |
Expected Dividend Yield | 3.41 |  | - | 3.41 |  |  | 2.62 |  | - | 2.62 |
Weighted-Average Expected Life in Years |  |  |  |  |  |  |  |  |
Employee Grants | 4 |  | - | 6.5 |  | 4 |  | - | 7
Director Grants | N/A |  | 5.5
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] | Tandem Award activity for the three months ended March 31, 2016 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 | 1,428,157 |  |  | $ | 39.75 |  |  |  |  |
Granted | 300,827 |  |  | 27.71 |  |  |  |  |
Exercised | — |  |  | — |  |  |  |  |
Forfeited or Expired | (257,000 | ) |  | 46.45 |  |  |  |  |
Outstanding at March 31, 2016 | 1,471,984 |  |  | $ | 36.12 |  |  | 6.70 |  | $ | 0.8 |
Vested and Expected to Vest at March 31, 2016 | 1,415,681 |  |  | $ | 36.25 |  |  | 6.60 |  | $ | 0.7 |
Exercisable at March 31, 2016 | 751,437 |  |  | $ | 38.96 |  |  | 4.30 |  | $ | — |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] | Information pertaining to Tandem Awards outstanding at March 31, 2016 is presented below.
|  |  |  | Outstanding |  | Exercisable
Range of Exercise Prices Per Share ($) |  | Shares Subject to Tandem Awards |  | Weighted- average Exercise Price Per Share ($) |  | Weighted- average Remaining Contractual Life (in Years) |  | Shares Subject to Tandem Awards |  | Weighted- average Exercise Price Per Share ($)
$ | 15.01 |  | - | $ | 20.00 |  |  | 4,000 |  |  | $ | 16.48 |  |  | 3.10 |  | 4,000 |  |  | $ | 16.48 |
20.01 |  | - | 25.00 |  |  | 14,500 |  |  | 23.47 |  |  | 3.82 |  | 14,500 |  |  | 23.47 |
25.01 |  | - | 30.00 |  |  | 376,577 |  |  | 27.90 |  |  | 8.97 |  | 75,750 |  |  | 28.67 |
30.01 |  | - | 35.00 |  |  | 168,625 |  |  | 33.19 |  |  | 6.27 |  | 131,998 |  |  | 33.12 |
35.01 |  | - | 40.00 |  |  | 575,000 |  |  | 36.56 |  |  | 7.22 |  | 290,187 |  |  | 36.83 |
40.01 |  | - | 45.00 |  |  | 103,782 |  |  | 40.70 |  |  | 9.64 |  | 5,502 |  |  | 40.70 |
45.01 |  | - | 50.00 |  |  | 229,500 |  |  | 49.73 |  |  | 0.84 |  | 229,500 |  |  | 49.73 |
15.01 |  | - | 50.00 |  |  | 1,471,984 |  |  | 36.12 |  |  | 6.69 |  | 751,437 |  |  | 38.96 |
Time Vested Shares [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | Activity related to nonvested time-based restricted stock and nonvested time-based RSUs for the three months ended March 31, 2016 was as follows:
| Time-based Restricted Stock Awards |  | Time-based RSU Awards
| Number of Shares |  | Weighted- average Grant-date Fair Value Per Share |  | Number of RSUs |  | Weighted- average Grant-date Fair Value Per RSU
Nonvested Balance at Beginning of the Year | 29,448 |  |  | $ | 33.77 |  |  | 85,048 |  |  | $ | 36.84 |
Granted | — |  |  | — |  |  | 40,201 |  |  | 27.71 |
Vested | (1,500 | ) |  | 29.95 |  |  | — |  |  | — |
Forfeited | (1,275 | ) |  | 35.89 |  |  | (16,150 | ) |  | 36.18 |
Nonvested Balance at End of Period | 26,673 |  |  | 33.88 |  |  | 109,099 |  |  | 33.57 |
Performance Shares [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | Activity related to nonvested performance-based restricted stock and nonvested performance-based RSUs for the three months ended March 31, 2016 is presented below.
| Performance-based Restricted Stock Awards |  | Performance-based RSU Awards
| Number of Shares |  | Weighted- average Grant-date Fair Value Per Share |  | Number of RSUs |  | Weighted- average Grant-date Fair Value Per RSU
Nonvested Balance at Beginning of the Year | 51,400 |  |  | $ | 42.12 |  |  | 128,100 |  |  | $ | 41.85 |
Granted | — |  |  | — |  |  | 118,435 |  |  | 27.74 |
Vested | — |  |  | — |  |  | — |  |  | — |
Forfeited | (51,400 | ) |  | 42.12 |  |  | (9,550 | ) |  | 41.76 |
Nonvested Balance at End of Period | — |  |  | — |  |  | 236,985 |  |  | 34.80 |

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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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