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Stock Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation Expense | Stock-based compensation expense consisted of the following (in thousands):
|  | Years Ended December 31,
|  | 2018 |  | 2017 |  | 2016
Restricted stock and stock units - expense |  | $ | 44,953 |  |  | $ | 42,191 |  |  | $ | 42,699 |
Total Unrecognized Compensation Cost, Net of Estimated Forfeitures | Total unrecognized compensation cost, net of estimated forfeitures, consisted of the following (in thousands):
|  | December 31,
|  | 2018 |  | 2017 |  | 2016
Restricted stock and stock units - unrecognized future costs |  | $ | 65,557 |  |  | $ | 62,730 |  |  | $ | 60,481 |
Activity Under All Stock Plans and Weighted Average Exercise Prices | The following table reflects activity under all stock plans from December 31, 2015 through December 31, 2018, and the weighted average exercise prices (in thousands, except per share amounts):
|  | Restricted Stock Plans without Market-Condition |  | Restricted Stock Plans with Market-Condition |  | Stock Option Plans
|  | Number of Shares/ Units |  | Weighted Average Grant Date Fair Value |  | Number of Shares/ Units |  | Weighted Average Grant Date Fair Value |  | Number of Shares/ Units |  | Weighted Average Exercise Price Per Share
Outstanding, December 31, 2015 |  |  | 1,052 |  |  |  | $46.88 |  |  | 992 |  |  |  | $52.89 |  |  | 12 |  |  |  | $32.36
Granted |  |  | 772 |  |  |  | $38.47 |  |  | 358 |  |  |  | $45.93 |  |  | — |  |  |  | —
Exercised |  |  | — |  |  |  | — |  |  | — |  |  |  | — |  |  | (7 | ) |  |  | $32.36
Restrictions lapsed |  |  | (545 | ) |  |  | $42.42 |  |  | (364 | ) |  |  | $43.04 |  |  | — |  |  |  | —
Forfeited |  |  | (36 | ) |  |  | $41.28 |  |  | (36 | ) |  |  | $43.04 |  |  | (5 | ) |  |  | $32.36
Outstanding, December 31, 2016 |  |  | 1,243 |  |  |  | $43.78 |  |  | 950 |  |  |  | $54.42 |  |  | — |  |  |  | —
Granted |  |  | 904 |  |  |  | $47.86 |  |  | 50 |  |  |  | $50.09 |  |  | — |  |  |  | —
Restrictions lapsed |  |  | (616 | ) |  |  | $44.09 |  |  | (384 | ) |  |  | $50.09 |  |  | — |  |  |  | —
Forfeited |  |  | (41 | ) |  |  | $43.68 |  |  | — |  |  |  | — |  |  | — |  |  |  | —
Outstanding, December 31, 2017 |  |  | 1,490 |  |  |  | $46.13 |  |  | 616 |  |  |  | $56.76 |  |  | — |  |  |  | —
Granted |  |  | 811 |  |  |  | $57.04 |  |  | — |  |  |  | — |  |  | — |  |  |  | —
Restrictions lapsed |  |  | (568 | ) |  |  | $47.62 |  |  | (129 | ) |  |  | $71.86 |  |  | — |  |  |  | —
Forfeited |  |  | (40 | ) |  |  | $49.10 |  |  | (129 | ) |  |  | $71.86 |  |  | — |  |  |  | —
Outstanding, December 31, 2018 |  |  | 1,693 |  |  |  | $50.78 |  |  | 358 |  |  |  | $45.93 |  |  | — |  |  |  | —
Pre-Tax Intrinsic Value of Stock Option Exercised | The total pre-tax intrinsic value of stock options exercised and the total fair value of shares vested during the years ended December 31, 2018, 2017 and 2016, are reflected in the following table (in thousands):
|  | Years Ended December 31,
|  | 2018 |  | 2017 |  | 2016
Total pre-tax intrinsic value of stock options exercised |  | $ | — |  |  | $ | — |  |  | $ | 52 |
Total fair value of shares vested |  | $ | 40,583 |  |  | $ | 50,385 |  |  | $ | 39,302 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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