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Share-Based Compensation | 3 Months Ended
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Mar. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Share-Based Compensation | 7. Share-Based Compensation The Company has share-based compensation plans, which are more fully described in Note 9, Share-Based Compensation, to the Consolidated Financial Statements in the 2016 10-K. During the three months ended March 31, 2017, the Company granted stock appreciation rights, or SARs, subject to service conditions and service and performance conditions. For the three months ended March 31, 2017 and 2016, share-based compensation expense amounted to $11.3 million and $9.8 million, respectively. As of March 31, 2017, the total unrecognized compensation cost related to all non-vested stock awards was $75.1 million and the related weighted-average period over which it is expected to be recognized is approximately 1.7 years. The following tables summarize the activity under all share-based compensation plans for the three months ended March 31, 2017:
SARs |  | Awards |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value(1) |
|  | (In thousands) |  |  |  |  |  |  |  |  | (In millions) |
Outstanding at December 31, 2016(2)(3) |  |  | 11,998 |  |  | $ | 41.52 |  |  | 6.0 years |  | $ | 148.7 |
Granted |  |  | 1,345 |  |  | $ | 57.19 |  |  |  |  |  |  |
Exercised |  |  | (481 | ) |  | $ | 21.39 |  |  |  |  |  |  |
Forfeited |  |  | (34 | ) |  | $ | 54.97 |  |  |  |  |  |  |
Outstanding at March 31, 2017(2) (3) |  |  | 12,828 |  |  | $ | 43.88 |  |  | 6.4 years |  | $ | 211.4 |
Exercisable at March 31, 2017(4) |  |  | 7,223 |  |  | $ | 39.34 |  |  | 4.7 years |  | $ | 157.1 |
(1) | The intrinsic value is the amount by which the current market value of the underlying stock exceeds the exercise price of the stock awards.
(2) | Includes 0.1 million market condition SARs as of both March 31, 2017 and December 31, 2016.
(3) | Includes 3.3 million and 2.9 million performance condition SARs as of March 31, 2017 and December 31, 2016, respectively.
(4) | Includes 1.1 million performance condition SARs.
The weighted-average grant date fair value of SARs granted during the three months ended March 31, 2017 and 2016 was $28.32 and $21.69, respectively. The total intrinsic value of SARs exercised during the three months ended March 31, 2017 and 2016 was $16.8 million and $5.9 million, respectively.
Incentive Plan and Independent Directors Stock Units |  | Shares |  |  | Weighted Average Grant Date Fair Value |
|  | (In thousands) |  |  |  |  |
Outstanding and nonvested December 31, 2016 |  |  | 26 |  |  | $ | 62.35 |
Granted |  | — |  |  | — |
Vested |  |  | (1 | ) |  | $ | 61.14 |
Forfeited |  | — |  |  | — |
Outstanding and nonvested March 31, 2017 |  |  | 25 |  |  | $ | 62.37 |
The total vesting date fair value of stock units which vested during both the three months ended March 31, 2017 and 2016 was less than $0.1 million.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 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) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: 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 5: 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 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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