Long-Term Debt (Details) (USD $)	0 Months Ended	1 Months Ended	6 Months Ended	12 Months Ended						1 Months Ended	6 Months Ended	12 Months Ended													12 Months Ended
	May 30, 2013	Jan. 31, 2014	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2014 Line of Credit [Member] Senior Secured Revolving Credit Facility October 2015 [Member]	Dec. 31, 2013 Line of Credit [Member] Senior Secured Revolving Credit Facility October 2015 [Member]	Dec. 31, 2012 Line of Credit [Member] Senior Secured Revolving Credit Facility October 2015 [Member]	Oct. 28, 2010 Line of Credit [Member] Senior Secured Revolving Credit Facility October 2015 [Member]	Jan. 31, 2014 Convertible Subordinated Debt [Member] Convertible Senior Subordinated Debentures February 2027 [Member]	Jun. 30, 2013 Convertible Subordinated Debt [Member] Convertible Senior Subordinated Debentures February 2027 [Member]	Dec. 31, 2013 Convertible Subordinated Debt [Member] Convertible Senior Subordinated Debentures February 2027 [Member]	Dec. 31, 2012 Convertible Subordinated Debt [Member] Convertible Senior Subordinated Debentures February 2027 [Member]	Dec. 31, 2013 Notes Payable, Other Payables [Member] Other Notes and Lease Obligations [Member]	Dec. 31, 2012 Notes Payable, Other Payables [Member] Other Notes and Lease Obligations [Member]	Dec. 31, 2014 Maximum [Member] Line of Credit [Member] Senior Secured Revolving Credit Facility October 2015 [Member]	Sep. 30, 2014 Maximum [Member] Line of Credit [Member] Senior Secured Revolving Credit Facility October 2015 [Member]	Jun. 30, 2014 Maximum [Member] Line of Credit [Member] Senior Secured Revolving Credit Facility October 2015 [Member]	Mar. 31, 2014 Maximum [Member] Line of Credit [Member] Senior Secured Revolving Credit Facility October 2015 [Member]	Dec. 31, 2013 Maximum [Member] Line of Credit [Member] Senior Secured Revolving Credit Facility October 2015 [Member]	May 28, 2013 Maximum [Member] Line of Credit [Member] Senior Secured Revolving Credit Facility October 2015 [Member]	Dec. 31, 2013 Maximum [Member] Convertible Subordinated Debt [Member] Senior Secured Revolving Credit Facility October 2015 [Member]	Dec. 31, 2013 Minimum [Member] Line of Credit [Member] Senior Secured Revolving Credit Facility October 2015 [Member]	May 28, 2013 Minimum [Member] Line of Credit [Member] Senior Secured Revolving Credit Facility October 2015 [Member]	Dec. 31, 2013 Minimum [Member] Convertible Subordinated Debt [Member] Convertible Senior Subordinated Debentures February 2027 [Member]
Debt Instrument [Line Items]
Reduction to EBITDA Related to Cash Charges				$ 3,871,000
Payments of Debt Issuance Costs		375,000	436,000
Interest Rate												4.125%
Period of Consecutive Trading Days Preceding the Date on which the Notice of Conversion is Given												30 days
Debt Amendment Date	May 30, 2013
Trading Days Common Stock above Conversion Price																									20 days
Long-term Debt				45,286,000	234,802,000		28,109,000	217,494,000				10,641,000	10,009,000	6,536,000	7,299,000
Long-term Debt, Current Maturities				(14,102,000)	(5,427,000)
Long-term Debt, Excluding Current Maturities				31,184,000	229,375,000
Line of Credit Facility, Maximum Borrowing Capacity							250,000,000		400,000,000
Line of Credit Facility, Current Borrowing Capacity						100,000,000	200,000,000
Write off of Deferred Debt Issuance Cost										1,070,000	1,216,000	11,000	1,554,000
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
Future One-Time Cash Restructuring Charges Added Back to EBITDA		$ 20,000,000	$ 15,000,000
Increase in Basis Points in the Margin Applicable to Determing the Interest Rate on New Debt	25	25
Increase in Basis Points for Commitment Fees for New Debt	10