Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Abstract]
Tax benefit at U.S. Statutory Rate of 35%	$ 2,811	$ 5,435	$ 9,524
State and local income taxes, net of federal income tax	4,497	155	34,605
Equity in net income of affiliates	526	(13,589)	(12,019)
Extraterritorial income exclusion	3,468	6,177	11,200
Domestic production activity benefit		2,317
Provision for unrecognized tax benefits	(833)	(332)	46,542
interest on deferred installment sale	(216)	(1,296)
Nondeductible expenses	(1,359)	(762)	(603)
Change in valuation allowance	(624)	(121)	2,311
Federal research and development credit		402	99
Foreign income taxes	(143)	(130)
Other, net	(22)	(97)	1,656
Income tax benefit (provision)	$ 8,105us-gaap_IncomeTaxExpenseBenefit	$ (1,841)us-gaap_IncomeTaxExpenseBenefit	$ 93,315us-gaap_IncomeTaxExpenseBenefit
U.S. statutory rate	35.00%	35.00%	35.00%

Income tax reconciliation, interest on deferred installment sales.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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