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Stock-based Compensation: Incentive Award Plan and Employee Stock Purchase Plan Stock-based Compensation: Incentive Award Plan and Employee Stock Purchase Plan (Range of Prices) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price, low end of the range (in dollars per share)	$ 4.44
Exercise price, high end of the range (in dollars per share)	$ 16.51
Options outstanding (in shares)	356,386	694,881
Options outstanding - weighted average remaining contractual life (years)	3 years 6 months	3 years 6 months
Options outstanding - weighted average exercise price (in dollars per share)	$ 12.11	$ 11.33
Options exercisable - at the end of period (in shares)	340,503
Options exercisable - weighted average exercise price (in dollars per share)	$ 11.94
$4.44 - 8.26
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price, low end of the range (in dollars per share)	4.44
Exercise price, high end of the range (in dollars per share)	$ 8.26
Options outstanding (in shares)	73,901
Options outstanding - weighted average remaining contractual life (years)	4 years
Options outstanding - weighted average exercise price (in dollars per share)	$ 6.96
Options exercisable - at the end of period (in shares)	73,305
Options exercisable - weighted average exercise price (in dollars per share)	$ 6.95
$10.46 - 11.75
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price, low end of the range (in dollars per share)	10.46
Exercise price, high end of the range (in dollars per share)	$ 11.75
Options outstanding (in shares)	61,885
Options outstanding - weighted average remaining contractual life (years)	4 years 3 months 18 days
Options outstanding - weighted average exercise price (in dollars per share)	$ 10.88
Options exercisable - at the end of period (in shares)	60,755
Options exercisable - weighted average exercise price (in dollars per share)	$ 10.89
$12.90 - 12.90
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price, low end of the range (in dollars per share)	12.90
Exercise price, high end of the range (in dollars per share)	$ 12.90
Options outstanding (in shares)	120,000
Options outstanding - weighted average remaining contractual life (years)	1 year 1 month 6 days
Options outstanding - weighted average exercise price (in dollars per share)	$ 12.90
Options exercisable - at the end of period (in shares)	120,000
Options exercisable - weighted average exercise price (in dollars per share)	$ 12.90
$13.31 - 13.58
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price, low end of the range (in dollars per share)	13.31
Exercise price, high end of the range (in dollars per share)	$ 13.58
Options outstanding (in shares)	25,600
Options outstanding - weighted average remaining contractual life (years)	1 year 4 months 24 days
Options outstanding - weighted average exercise price (in dollars per share)	$ 13.33
Options exercisable - at the end of period (in shares)	25,506
Options exercisable - weighted average exercise price (in dollars per share)	$ 13.32
$16.51 - 16.51
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price, low end of the range (in dollars per share)	16.51
Exercise price, high end of the range (in dollars per share)	$ 16.51
Options outstanding (in shares)	75,000
Options outstanding - weighted average remaining contractual life (years)	6 years 8 months 12 days
Options outstanding - weighted average exercise price (in dollars per share)	$ 16.51
Options exercisable - at the end of period (in shares)	60,937
Options exercisable - weighted average exercise price (in dollars per share)	$ 16.51

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Topic 718
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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