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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |
Schedule of Nonvested Share Activity [Table Text Block] | The following summarizes the activity of our PSUs and RSUs awarded under the 2013 Incentive Plan for the year ended December 31, 2014:
|  | PSUs |  | RSUs
|  | Number of shares |  | Weighted Average Grant-Date Fair Value |  | Number of shares |  | Weighted Average Grant-Date Fair Value
Outstanding, December 31, 2013 |  | 90,124 |  |  | $ | 26.65 |  |  | 14,161 |  |  | $ | 26.65 |
Granted |  | 100,692 |  |  | 30.32 |  |  | 128,497 |  |  | 30.41 |
Performance true-up |  | 10,767 |  |  | 26.65 |  |  | — |  |  | — |
Vested |  | (77,056 | ) |  | 26.65 |  |  | (64,807 | ) |  | 29.57 |
Forfeited |  | (7,968 | ) |  | 28.93 |  |  | (12,987 | ) |  | 30.32 |
Outstanding, December 31, 2014 |  | 116,559 |  |  | $ | 29.66 |  |  | $ | 64,864 |  |  | $ | 30.45 |
Stock options activity [Table Text Block] | The following is a summary of our stock option activity:
|  | Number of Options |  | Weighted Average Exercise Price Per Option |  | Weighted Average Remaining Contractual Life |  | Aggregate Intrinsic Value
|  |  |  |  |  | (years) |  | (thousands)
Outstanding, December 31, 2013 |  | 161,257 |  |  | $ | 27.19 |  |  |  |  |
Exercised |  | (7,850 | ) |  | 27.19 |  |  |  |  |
Cancelled/Forfeited |  | (12,175 | ) |  | 27.19 |  |  |  |  |
Outstanding, December 31, 2014 |  | 141,232 |  |  | $ | 27.19 |  |  | 8.2 |  | $ | 1,407 |
Vested and expected to vest, December 31, 2014 |  | 131,140 |  |  | $ | 27.19 |  |  | 8.2 |  | $ | 1,306 |
Exercisable, December 31, 2014 |  | 45,276 |  |  | $ | 27.19 |  |  | 8.2 |  | $ | 451 |
Assumptions used to calculate fair value of stock options [Table Text Block] |  | The fair value for stock option awards was estimated at the grant date using the Black-Scholes option valuation model with the following weighted average assumptions:
| Year Ended December 31, 2013
Expected volatility | 60.9 | %
Expected life (in years) | 6.0 |
Risk-free interest rate | 1.0 | %
Expected dividends | — |
Weighted average fair value per option granted | $ | 14.87 |
Stock-based compensation expense recognized [Table Text Block] | Total stock-based compensation recognized from PSUs, RSUs, and stock options net of estimated forfeitures, was as follows:
|  | Year Ended December 31
|  | 2014 |  | 2013
|  | (thousands)
PSUs |  | $ | 3,169 |  |  | $ | 1,932 |
RSUs |  | 2,018 |  |  | 274 |
Stock options |  | 729 |  |  | 663 |
Total |  | $ | 5,916 |  |  | $ | 2,869 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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) -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 share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units 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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