Long-Term Debt Line of Credit (Details) (Senior Secured Revolving Credit Facility October 2015 [Member], USD $)	12 Months Ended
	Dec. 31, 2013 Line of Credit [Member]	Dec. 31, 2012 Line of Credit [Member]	Oct. 28, 2010 Line of Credit [Member]	Dec. 31, 2013 Adjusted LIBOR [Member] Line of Credit [Member]	Dec. 31, 2013 Base Rate Option [Member] Line of Credit [Member]	Dec. 31, 2014 Maximum [Member] Line of Credit [Member]	Sep. 30, 2014 Maximum [Member] Line of Credit [Member]	Jun. 30, 2014 Maximum [Member] Line of Credit [Member]	Mar. 31, 2014 Maximum [Member] Line of Credit [Member]	Dec. 31, 2013 Maximum [Member] Line of Credit [Member]	May 28, 2013 Maximum [Member] Line of Credit [Member]	Dec. 31, 2013 Maximum [Member] Convertible Subordinated Debt [Member]	Dec. 31, 2013 Minimum [Member] Line of Credit [Member]	May 28, 2013 Minimum [Member] Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 250,000,000		$ 400,000,000
Debt Instrument, Basis Spread on Variable Rate				2.25%	1.25%
Line of Credit Facility, Commitment Fee Percentage	0.35%
Leverage Ratio	2.30	2.66				3.5	4.0	4.5	4.75	4.00	3.50	3.00
Interest Coverage Ratio	7.51	19.00											3.00	3.50
Line of Credit Facility, Remaining Borrowing Capacity	$ 40,143,000