Debt (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Line of Credit Facility [Line Items]
Amounts outstanding under line of credit
Modification Agreement [Member]
Line of Credit Facility [Line Items]
Amounts outstanding under line of credit
Secured Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt issuance date	Mar. 31, 2011
Line of credit, maximum borrowing capacity	8.0
Debt instrument, spread on variable reference rate	1.50%
Percentage of eligible accounts receivable	80.00%
Line of credit maturity date	Mar. 31, 2013
Amended Agreement [Member]
Line of Credit Facility [Line Items]
Debt issuance date	Apr. 29, 2013
Line of credit, maximum borrowing capacity	10.0
Aggregate facility amount available	12.5
Line of credit maturity date	Mar. 30, 2015
Modification Agreement [Member]
Line of Credit Facility [Line Items]
Debt issuance date	Oct. 03, 2014
Line of credit, maximum borrowing capacity	20.0
Aggregate facility amount available	$ 25.0
Debt instrument, spread on variable reference rate	0.75%
Basis spread on variable rate, if not meet minimum assets coverage ratio	2.25%
Line of credit maturity date	Oct. 03, 2016
Unused line fee percentage	0.25%