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Equity Incentive Program - Stock Options and SSARs (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SSARs, Number of Shares (in shares): |  |  |
Forfeited | 0 |  |
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |
Risk-free interest rate | 2.59% |  |
Dividend yield | 0.00% | 0.00% |
Expected life (years) | 4 years 6 months | 4 years 6 months | 4 years 6 months
Volatility | 41.20% |  |
SSARs, Weighted-average grant date fair value (in dollars per share): |  |  |
Granted | $ 14.34 |  |
Stock Options, Number of Shares (in share): |  |  |
Beginning balance | 4,901,739 |  |
Granted | 963,692 |  |
Exercised | (44,326) |  |
Forfeited | (120,458) |  |
Expired | (229,154) |  |
Ending balance | 5,471,493 | 4,901,739 |
Exercisable | 3,517,954 |  |
Stock Options, Weighted Average Exercise Price (in dollars per share): |  |  |
Beginning balance | $ 18.36 |  |
Granted | 14.34 |  |
Exercised | 11.02 |  |
Forfeited | 15.54 |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price | 21.63 |  |
Ending balance | 17.64 | $ 18.36 |
Exercisable | $ 19.31 |  |
SARS and Options, Additional Disclosures |  |  |
Options, aggregate intrinsic value, outstanding | $ 3,400 |  |
Options, aggregate intrinsic value, exercisable | $ 2,200 |  |
Options, weighted average remaining contractual term, outstanding | 4 years 1 month 6 days |  |
Options, weighted average remaining contractual term, exercisable | 3 years 6 months |  |
Unrecognized compensation expense | $ 5,800 |  |
Weighted average period for compensation expense to be recognized | 1 year 3 months 18 days |  |
SSARs and Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |
Dividend yield |  |  | 0.00%
SSARs |  |  |
SSARs, Number of Shares (in shares): |  |  |
Beginning balance | 850,516 |  |
Granted | 0 |  |
Exercised | (30,624) |  |
Expired | (37,897) |  |
Ending balance | 781,995 | 850,516 |
Exercisable | 781,995 |  |
SSARs, Weighted-average grant date fair value (in dollars per share): |  |  |
Beginning balance | $ 21.54 |  |
Granted | 0 |  |
Exercised | 12.26 |  |
Forfeited | 0 |  |
Expired | 22.79 |  |
Ending balance | 21.85 | $ 21.54 |
Exercisable | 21.85 |  |
Stock Options, Weighted Average Exercise Price (in dollars per share): |  |  |
Granted | $ 0 |  |
SARS and Options, Additional Disclosures |  |  |
SSARs, aggregate intrinsic value, outstanding | $ 0 |  |
SSARs, aggregate intrinsic value, exercisable | $ 0 |  |
SSARs, weighted average remaining contractual terms, outstanding | 3 years 1 month 6 days |  |
SSARs, weighted average remaining contractual term, exercisable | 3 years 1 month 6 days |  |
Unrecognized compensation expense | $ 0 |  |
Minimum | Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |
Risk-free interest rate |  | 1.73% | 1.04%
Volatility |  | 33.20% | 37.00%
Fair value at date of grant | $ 4.83 | $ 5.02 | $ 3.76
Maximum | Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |
Risk-free interest rate |  | 1.93% | 1.25%
Volatility |  | 38.80% | 39.60%
Fair value at date of grant | $ 6.59 | $ 6.73 | $ 4.83

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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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