Debt - Additional disclosures related to the 6.00% Convertible Guaranteed Notes due 2030 (Details) - 6% Convertible Guaranteed Note [Member] - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2010
Debt Instrument [Line Items]
Principal amount of debt component	$ 11,900,000		$ 11,900,000		$ 12,400,000	$ 115,000,000
Unamortized discount	(110,000)		(110,000)		(220,000)
Unamortized debt issuance costs	(27,000)		(27,000)		(54,000)
Carrying amount of debt component	11,763,000		11,763,000		12,126,000
Carrying amount of equity component	$ (34,932,000)		$ (34,932,000)		$ (34,784,000)
Effective interest rate	8.00%		8.00%		7.80%
Aggregate if-converted value in excess of aggregate principal amount			$ 6,935,000		$ 2,863,000
Stated interest rate	6.00%	6.00%	6.00%	6.00%	6.00%
Coupon interest	$ 170,000	$ 156,000	$ 356,000	$ 392,000
Discount amortization	51,000	55,000	104,000	122,000
Interest expense	$ 221,000	$ 211,000	$ 460,000	$ 514,000

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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