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Shareholders' Equity and Common Stock Equivalents (Tables) | 12 Months Ended
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Dec. 31, 2017
Shareholders Equity And Stock Options [Abstract] |
Summary of stock units and stock options outstanding under the Comprehensive Plan | As further described in the paragraphs below, outstanding stock units and stock options under the Comprehensive Plan were as follows:
|  | December 31,
|  | 2017 |  | 2016 |  | 2015
CSUs related to deferred compensation for Directors |  | 61,677 |  |  | 74,058 |  |  | 85,200 |
CSUs related to deferred compensation for employees |  | 24,903 |  |  | 51,502 |  |  | 55,443 |
Stock options |  | 719,015 |  |  | 747,032 |  |  | 669,693 |
RSUs related to incentive compensation |  | 1,149,679 |  |  | 1,419,268 |  |  | 1,442,325 |
Total |  | 1,955,274 |  |  | 2,291,860 |  |  | 2,252,661 |
Summary of changes in outstanding options | Changes in outstanding options were as follows:
|  | Weighted Average Option Price per Share |  | Range of Option Prices per Share |  | Options
|  |  |  | Outstanding |  | Vested and Exercisable
December 31, 2016 |  | $27.67 |  | $13.83-$36.04 |  | 747,032 |  |  | 273,117 |
Granted |  | $41.83 |  | $38.05-$41.95 |  | 222,828 |  |  | — |
Vested |  | $27.12 |  | $17.01-$36.04 |  | — |  |  | 193,510 |
Exercised |  | $23.63 |  | $13.83-$32.35 |  | (208,306 | ) |  | (208,306 | )
Forfeited |  | $34.97 |  | $28.88-$41.95 |  | (42,539 | ) |  | — |
Expired |  | — |  | — |  | — |  |  | — |
December 31, 2017 |  | $32.80 |  | $17.01-$41.95 |  | 719,015 |  |  | 258,321 |
Summary of options outstanding segregated by ranges of exercise prices | Option information segregated by ranges of exercise prices was as follows:
|  | December 31, 2017
|  |  |  | Total Outstanding Options |  | Vested and Exercisable Options
|  | Range of Option Prices per Share |  | Options |  | Weighted Average Option Price per Share |  | Weighted Average Remaining Term |  | Options |  | Weighted Average Option Price per Share |  | Weighted Average Remaining Term
|  | $17.01-$22.69 |  | 78,774 |  |  | $19.30 |  | 1.55 years |  | 78,774 |  |  | $19.30 |  | 1.55 years
|  | $22.88-$33.41 |  | 424,057 |  |  | $30.81 |  | 7.53 years |  | 177,686 |  |  | $30.49 |  | 7.12 years
|  | $36.04-$41.95 |  | 216,184 |  |  | $41.62 |  | 9.17 years |  | 1,861 |  |  | $36.04 |  | 8.73 years
Total |  | $17.01-$41.95 |  | 719,015 |  |  | $32.80 |  | 7.37 years |  | 258,321 |  |  | $27.12 |  | 5.43 years
Summary of changes in outstanding restricted common stock units | Changes in outstanding RSUs were as follows:
|  | Total Outstanding Units |  | Vested Units
|  | Units |  | Weighted Average Grant Date Fair Value per Unit |  | Units |  | Weighted Average Grant Date Fair Value per Unit
December 31, 2016 |  | 1,419,268 |  |  | $27.63 |  | 768,064 |  |  | $16.80
Granted (1) |  | 193,044 |  |  | $40.77 |  | — |  |  | —
Vested |  | — |  |  | — |  | 179,755 |  |  | $29.15
Forfeited |  | (72,953 | ) |  | $32.58 |  | — |  |  | —
Distributed (2) |  | (389,680 | ) |  | $20.16 |  | (389,680 | ) |  | $20.16
December 31, 2017 |  | 1,149,679 |  |  | $32.05 |  | 558,139 |  |  | $19.80
____________________
(1) | Includes dividends reinvested into additional RSUs.
(2) Includes distributed units which were utilized to satisfy withholding taxes due on the distribution.

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