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Stock-Based Compensation - Schedule of SAR Activity (Details) - SARs - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Shares |  |  |  |  |
Outstanding, beginning balance (in shares) | 152,600 | 302,581 | 242,581 | 362,581 |
Granted (in shares) | 5,000 | 106,800 | 60,000 | 0 |
Exercised (in shares) | 0 | 0 | 0 | (120,000) |
Forfeited (in shares) | (67,130) | (195,490) | 0 | 0 |
Expired (in shares) | (6,750) | (61,291) | 0 | 0 |
Outstanding, ending balance (in shares) | 83,720 | 152,600 | 302,581 | 242,581 | 362,581
Exercisable (in shares) | 39,360 | 0 | 61,291 | 61,291 |
Weighted-Average Exercise Price |  |  |  |  |
Outstanding, beginning balance (in dollars per share) | $ 16.55 | $ 22.53 | $ 22.07 | $ 22.07 |
Granted (in dollars per share) | 7.37 | 11.43 | 24.41 | 0.00 |
Exercised (in dollars per share) | 0.00 | 0.00 | 0.00 | 22.07 |
Forfeited (in dollars per share) | 23.16 | 21.28 | 0.00 | 0.00 |
Expired (in dollars per share) | 12.68 | 22.07 | 0.00 | 0.00 |
Outstanding, ending balance (in dollars per share) | 11.02 | 16.55 | 22.53 | 22.07 | $ 22.07
Exercisable (in dollars per share) | $ 11.25 | $ 0.00 | $ 22.07 | $ 22.07 |
Weighted-Average Remaining Contractual Term (years) |  |  |  |  |
Outstanding (term) | 8 years 2 months 16 days | 9 years 7 days | 7 years 1 month 6 days | 7 years 5 months 8 days | 8 years 5 months 8 days
Exercisable (term) | 8 years 1 month 24 days |  | 6 years 5 months 8 days | 7 years 5 months 8 days |
Aggregate Intrinsic Value (in thousands) |  |  |  |  |
Outstanding | $ 1,000 | $ 0 | $ 0 | $ 7,166 | $ 19,228
Exercised |  |  |  | 6,673 |
Exercisable | $ 0 | $ 0 | $ 0 | $ 1,811 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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