Note 8 - Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2012

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Fair Value Measurements Using
June 30, 2012	Fair Value		Quoted Prices in Active Markets For Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and cash equivalents	$	69,209	$	69,209	$	–	$	–
Restricted cash and cash equivalents		52,937		52,937		–		–
Marketable equity securities		97,602		97,602		–		–
Corporate debt securities		33,364		–		33,364		–
Commercial mortgage–backed securities		30,593		–		30,593		–
U.S. Treasury securities		14,571		14,571		–		–
State and municipal securities		8,910		–		8,910		–
Total financial assets	$	307,186	$	234,319	$	72,867	$	–

	Fair Value Measurements Using
December 31, 2011	Fair Value		Quoted Prices in Active Markets For Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and cash equivalents	$	61,008	$	61,008	$	–	$	–
Restricted cash and cash equivalents		50,587		50,587		–		–
Marketable equity securities		85,051		85,051		–		–
Corporate debt securities		34,074		–		34,074		–
Commercial mortgage–backed securities		33,904		–		33,904		–
U.S. Treasury securities		8,070		8,070		–		–
State and municipal securities		7,577		–		7,577		–
Total financial assets	$	280,271	$	204,716	$	75,555	$	–