Debt (Other Credit Facilities) (Narrative) (Details) (Other Credit Facilities [Member], USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 Plan [Member]	Jun. 30, 2014 Revolving Credit Facility [Member]	Dec. 31, 2013 Revolving Credit Facility [Member]	Jun. 30, 2014 Revolving Credit Facility [Member] Weighted Average [Member]	Jun. 30, 2014 Letter of Credit [Member]	Jun. 30, 2014 Letter of Credit [Member] Weighted Average [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 70,300,000
Line of credit facility, capacity available for specific purpose						11,200,000
Credit facility, amount outstanding			46,800,000	0
Line of credit facility, letters of credit issued	$ 10,500,000
Line of credit facility, interest rate					3.75%		1.80%
Line of credit facility, maturity date	Mar. 03, 2015
Debt instrument, intent to refinance, description		Outstanding borrowings under other credit facilities that are not renewed are repaid with borrowings under the Credit Facility. Accordingly, the carrying amounts of other credit facility borrowings are classified within long-term debt in the Company's condensed unaudited consolidated balance sheets as of June 30, 2014.