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Equity-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable [Table Text Block] | A summary of the status of exercisable stock option awards as of December 31, 2017, and changes during the year, is presented below:
|  | Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
Exercisable options at January 1, 2017 |  | 137,860 |  |  | $ | 66.85 |  |  |  |  |
Expired |  | (5,913 | ) |  | 66.97 |  |  |  |  |
Exercisable options at December 31, 2017 |  | 131,947 |  |  | $ | 66.85 |  |  | 6.0 |  | $ | — |
Employee Equity-Based Compensation Expense | Employee equity-based compensation expense was recognized as follows:
(In thousands) |  | 2017 |  | 2016 |  | 2015
Restricted stock units |  | $ | 1,618 |  |  | $ | 1,381 |  |  | $ | 2,116 |
Performance shares |  | 2,283 |  |  | 3,311 |  |  | 4,408 |
Stock options |  | 2,552 |  |  | 2,913 |  |  | 2,106 |
Total employee equity-based compensation |  | $ | 6,453 |  |  | $ | 7,605 |  |  | $ | 8,630 |
Related tax benefit |  | $ | 2,149 |  |  | $ | 2,767 |  |  | $ | 3,193 |
Summary of Status of Outstanding RSU Awards | A summary of the status of outstanding unvested RSU awards as of December 31, 2017, 2016, and 2015, and changes during those years, is presented below:
|  | 2017 |  | 2016 |  | 2015
|  | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value
Unvested shares outstanding at |  |  |  |  |  |  |  |  |  |  |  |
January 1 |  | 54,460 |  |  | $ | 47.16 |  |  | 46,029 |  |  | $ | 60.17 |  |  | 93,254 |  |  | $ | 47.95 |
Granted |  | 66,774 |  |  | 56.45 |  |  | 44,627 |  |  | 39.10 |  |  | 23,148 |  |  | 62.02 |
Vested |  | (17,531 | ) |  | 62.75 |  |  | (29,338 | ) |  | 55.16 |  |  | (65,217 | ) |  | 43.86 |
Forfeited |  | (9,232 | ) |  | 53.52 |  |  | (6,858 | ) |  | 47.80 |  |  | (5,156 | ) |  | 58.58 |
Unvested shares outstanding at December 31 |  | 94,471 |  |  | 50.22 |  |  | 54,460 |  |  | 47.16 |  |  | 46,029 |  |  | 60.17 |
Aggregate intrinsic value (in thousands) |  |  |  | $ | 4,289 |  |  |  |  | $ | 3,570 |  |  |  |  | $ | 2,096 |
Schedule of Share-based Compensation, Activity [Table Text Block] | A summary of the status of outstanding stock option awards as of December 31, 2017, and changes during the year, is presented below:
|  | Shares |  | Weighted Average Exercise Price |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
Outstanding options at December 31, 2014 |  | 150,580 |  |  | $ | 66.84 |  |  |  |  |  |  | $ | 258 |
Granted |  | 142,542 |  |  | 61.93 |  |  | $ | 20.82 |  |  |  |  |
Forfeited |  | (15,429 | ) |  | 64.12 |  |  |  |  |  |  |
Outstanding options at December 31, 2015 |  | 277,693 |  |  | $ | 64.47 |  |  |  |  |  |  | $ | — |
Granted |  | 280,191 |  |  | 38.86 |  |  | 14.42 |  |  |  |  |
Forfeited |  | (30,830 | ) |  | 47.79 |  |  |  |  |  |  |
Outstanding options at December 31, 2016 |  | 527,054 |  |  | $ | 51.83 |  |  |  |  |  |  | $ | 7,232 |
Granted |  | 158,484 |  |  | 56.45 |  |  | 18.82 |  |  |  |  |
Forfeited |  | (22,306 | ) |  | 50.74 |  |  |  |  |  |  |
Expired |  | (5,913 | ) |  | 66.97 |  |  |  |  |  |  |
Outstanding options at December 31, 2017 | 2,017 |  | 657,319 |  |  | $ | 52.84 |  |  |  |  | 7.4 |  | $ | — |
Assumption Used in Black-Scholes Option-Pricing Model to Estimate Fair Value of Stock Options |
Volatility | 30 | %
Risk-free interest rate | 2.05 | %
Expected life-years | 6.0 |
The fair value of performance share awards is estimated using a Monte Carlo simulation model. For performance shares granted in 2017, the following assumptions were used in our Monte Carlo model:
Closing price of stock on date of grant | $ | 56.75 |
Risk free rate | 1.42 | %
Measurement period | 3 years |
Volatility | 35 | %
Summary of Status of Outstanding Performance Share Awards | A summary of the status of outstanding performance share awards as of December 31, 2017, 2016, and 2015, and changes during those years, is presented below:
|  | 2017 |  | 2016 |  | 2015
|  | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value
Outstanding share awards at January 1 |  | 175,683 |  |  | $ | 62.26 |  |  | 92,563 |  |  | $ | 84.18 |  |  | 300,864 |  |  | $ | 59.77 |
Granted |  | 33,907 |  |  | 58.58 |  |  | 93,397 |  |  | 39.70 |  |  | 47,513 |  |  | 62.05 |
Settled |  | (87,491 | ) |  | 84.65 |  |  | — |  |  | — |  |  | (245,525 | ) |  | 50.43 |
Forfeited |  | (4,847 | ) |  | 47.61 |  |  | (10,277 | ) |  | 54.55 |  |  | (10,289 | ) |  | 73.61 |
Outstanding share awards at December 31 |  | 117,252 |  |  | 45.10 |  |  | 175,683 |  |  | 62.26 |  |  | 92,563 |  |  | 84.18 |
Aggregate intrinsic value (in thousands) |  |  |  | $ | 5,323 |  |  |  |  | $ | 11,516 |  |  |  |  | $ | 4,214 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 (h)(1) -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 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure of the changes in other outstanding share-based compensation awards other than stock options or nonvested awards. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + 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 Tabular disclosure of the following for fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position: the number, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term of options (or share units) currently exercisable (or convertible). + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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