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Stock-Based Compensation Plans Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Valuation assumptions | The weighted-average estimated value of SPRs outstanding as of December 31, 2017 was $9.83 per SPR using the following assumptions:
Expected volatility | 20.5% to 44.2%
Risk-free rate of return | 1.2% to 2.2%
Expected term (in years) | 0.1 to 4.5
Expected annual dividend | $0
Activity related to SPRs | Activity related to the Company’s SPRs during the year ended December 31, 2017 was as follows:
| Number of SPRs |  | Weighted Average Exercise Price
Outstanding on December 31, 2016 | 946,701 |  |  | $ | 19.60 |
Granted | 78,948 |  |  | 25.12 |
Exercised | (34,095 | ) |  | 12.99 |
Cancelled | (30,000 | ) |  | 36.71 |
Outstanding on December 31, 2017 | 961,554 |  |  | 9.76 |
Exercisable on December 31, 2017 | 702,438 |  |  | $ | 17.66 |
Activity related to RSAs | Activity related to the Company’s RSAs during the year ended December 31, 2017 was as follows:
| Restricted Stock Awards
Outstanding on December 31, 2016 | 31,897 |
Granted | 104,920 |
Exchanged for shares | (31,897 | )
Outstanding on December 31, 2017 | 104,920 |
MSU Rollforward | Market Stock Units ("MSUs") are exchangeable for between 0% to 150% of the Company's common shares at the end of the vesting period based on the trailing 60 day average closing price of the Company's common stock. The value of the MSUs was determined using a geometric brownian motion model that, based on certain variables, generates a large number of random trials simulating the price of the common stock over the measurement period. Expense of $0.9 million, $0.5 million and $0.5 million related to MSUs was recorded in the years ended December 31, 2017, 2016 and 2015, respectively. Activity related to the Company’s MSUs during the year ended December 31, 2017 was as follows:
| Number of Market Stock Units |  | Maximum Shares Potentially Issuable
Outstanding on December 31, 2016 | 149,532 |  |  | 224,298 |
Granted | 98,243 |  |  | 147,365 |
Cancelled | (25,839 | ) |  | (38,759 | )
Outstanding on December 31, 2017 | 221,936 |  |  | 332,904 |
Stock Option Activity Table | Stock Options Each stock option can be exchanged for one share of the Company’s common stock at the stated exercise price. Activity related to stock options during the year ended December 31, 2017 was as follows:
| Number of Stock Options |  | Weighted average exercise price
Outstanding on December 31, 2016 | 45,910 |  |  | 26.55 |
Granted | 40,000 |  |  | 27.01 |
Exercised | (1,434 | ) |  | 14.04 |
Outstanding on December 31, 2017 | 84,476 |  |  | 26.98 |
Expense related to stock options was $0.2 million in 2017 and unrecognized compensation at December 31, 2017 was $0.1 million.

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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