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Stock-Based Compensation - Schedule of Stock Appreciation Rights (Details) - Stock Appreciation Rights - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Summary of Stock Appreciation Rights Activity (in shares) |  |  |
Outstanding at beginning of period (in shares) | 558,546 | 667,764 | 667,764
Granted (in shares) |  | 0 | 0
Exercised (in shares) | (75,260) | (109,218) | 0
Forfeited (in shares) | 0 | 0 | 0
Outstanding at end of period (in shares) | 483,286 | 558,546 | 667,764
Exercisable at end of period (in shares) | 483,286 | 558,546 | 590,960
Weighted-Average Exercise Price (in dollars per share) |  |  |
Outstanding at beginning of period (in USD per share) | $ 12.52 | $ 12.63 | $ 12.63
Granted (in USD per share) |  | 0.00 | 0.00
Exercised (in USD per share) | 9.19 | 13.19 | 0.00
Forfeited (in USD per share) | 0.00 | 0.00 | 0.00
Outstanding at end of period (in USD per share) | 13.04 | 12.52 | 12.63
Exercisable at end of period (in USD per share) | $ 13.04 | $ 12.52 | $ 11.98
Additional disclosures |  |  |
Aggregate intrinsic value | $ 5.0 |  |
Weighted-average remaining contractual term of non-vested shares | 1 year 5 months 21 days |  |
Aggregate intrinsic value of stock appreciation rights exercisable | $ 5.0 |  |
Stock appreciation rights exercisable, weighted average remaining contractual term | 1 year 5 months 21 days |  |

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- Definition The intrinsic value of vested and nonvested awards on equity-based plans excluding option plans (for example, stock appreciation rights plans) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units, as calculated by applying the disclosed pricing methodology. + References No definition available. + Details
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- Definition The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of equity instruments other than options outstanding and currently exercisable under the share-based compensation plan as of the balance sheet date. + References No definition available. + Details
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- Definition The number of shares as of the balance sheet date into which fully or partially vested equity instruments other than options outstanding as of the balance sheet date can be currently converted under the share-based compensation plan. + References No definition available. + Details
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- Definition The weighted average period between the balance sheet date and expiration for all equity awards other than options awarded under a share-based compensation plan. + References No definition available. + Details
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- Definition The weighted average exercise price of exercisable awards on equity-based plans excluding option plans (for example, stock appreciation rights plans), including vested instruments. + References No definition available. + Details
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- Definition The weighted average exercise price of awards exercised in the period on equity-based plans excluding option plans (for example, stock appreciation rights plans). + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of non-option equity instruments exercised by participants. + 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)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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