Fair Value Measurements (Details) (USD $) In Thousands																																																	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2011 Fair Value Measurements Recurring [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Quoted Prices in Active Markets for Indentical Assets (Level 1) [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Quoted Prices in Active Markets for Indentical Assets (Level 1) [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Quoted Prices in Active Markets for Indentical Assets (Level 1) [Member] Money Market Funds [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Quoted Prices in Active Markets for Indentical Assets (Level 1) [Member] Money Market Funds [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Quoted Prices in Active Markets for Indentical Assets (Level 1) [Member] Other Debt Securities [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Quoted Prices in Active Markets for Indentical Assets (Level 1) [Member] Other Debt Securities [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Quoted Prices in Active Markets for Indentical Assets (Level 1) [Member] Derivative Financial Instruments Assets [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Quoted Prices in Active Markets for Indentical Assets (Level 1) [Member] Derivative Financial Instruments Assets [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Quoted Prices in Active Markets for Indentical Assets (Level 1) [Member] Derivative Financial Instruments Liabilities [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Quoted Prices in Active Markets for Indentical Assets (Level 1) [Member] Derivative Financial Instruments Liabilities [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Quoted Prices in Active Markets for Indentical Assets (Level 1) [Member] Redeemable Noncontrolling Interest [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Quoted Prices in Active Markets for Indentical Assets (Level 1) [Member] Redeemable Noncontrolling Interest [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Money Market Funds [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Money Market Funds [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Other Debt Securities [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Other Debt Securities [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Derivative Financial Instruments Assets [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Derivative Financial Instruments Assets [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Derivative Financial Instruments Liabilities [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Derivative Financial Instruments Liabilities [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Redeemable Noncontrolling Interest [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Redeemable Noncontrolling Interest [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Unobservable Inputs (Level 3) [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Unobservable Inputs (Level 3) [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Unobservable Inputs (Level 3) [Member] Money Market Funds [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Unobservable Inputs (Level 3) [Member] Money Market Funds [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Unobservable Inputs (Level 3) [Member] Other Debt Securities [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Unobservable Inputs (Level 3) [Member] Other Debt Securities [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Unobservable Inputs (Level 3) [Member] Derivative Financial Instruments Assets [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Unobservable Inputs (Level 3) [Member] Derivative Financial Instruments Assets [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Unobservable Inputs (Level 3) [Member] Derivative Financial Instruments Liabilities [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Unobservable Inputs (Level 3) [Member] Derivative Financial Instruments Liabilities [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Unobservable Inputs (Level 3) [Member] Redeemable Noncontrolling Interest [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Unobservable Inputs (Level 3) [Member] Redeemable Noncontrolling Interest [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Money Market Funds [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Money Market Funds [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Other Debt Securities [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Other Debt Securities [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Derivative Financial Instruments Assets [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Derivative Financial Instruments Assets [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Derivative Financial Instruments Liabilities [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Derivative Financial Instruments Liabilities [Member]	Jun. 30, 2011 Fair Value Measurements Recurring [Member] Redeemable Noncontrolling Interest [Member]	Dec. 31, 2010 Fair Value Measurements Recurring [Member] Redeemable Noncontrolling Interest [Member]	Jun. 30, 2011 Other Debt Securities [Member]	Jun. 30, 2010 Other Debt Securities [Member]	Jun. 30, 2011 Other Debt Securities [Member]	Jun. 30, 2010 Other Debt Securities [Member]	Jun. 30, 2011 Redeemable Noncontrolling Interest [Member]	Jun. 30, 2010 Redeemable Noncontrolling Interest [Member]	Jun. 30, 2011 Redeemable Noncontrolling Interest [Member]	Jun. 30, 2010 Redeemable Noncontrolling Interest [Member]
Assets:
Total	$ 1,650	$ 39,192	$ 35	$ 37,154	$ 35	$ 37,154	$ 0	$ 0	$ 0	$ 0					$ 14	$ 312	$ 0	$ 0	$ 0	$ 0	$ 14	$ 312					$ 1,601	$ 1,726	$ 0	$ 0	$ 1,601	$ 1,726	$ 0	$ 0					$ 35	$ 37,154	$ 1,601	$ 1,726	$ 14	$ 312
Liabilities:
Total	7,696	8,515	0	0							0	0	0	0	904	969							904	969	0	0	6,792	7,546							0	0	6,792	7,546							904	969	6,792	7,546
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Beginning balance																																																	1,607	1,620	1,726	1,628
Included in earnings																																																	(4)	0	(2)	(1)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income																																																	(2)	6	(3)	(1)
Purchases																																																	0	45	53	45
Settlements																																																	0	0	(173)	0
Distribution Paid																																																	0	0	0	0
Redemption value adjustment																																																	0	0	0	0
Ending balance																																																	1,601	1,671	1,601	1,671
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date																																																	(4)	0	(2)	(1)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Beginning balance																																																					6,920	15,326	7,546	18,085
Included in earnings																																																					1	103	604	338
Included in other comprehensive income (loss)																																																					2	10	9	8
Purchases																																																					0	0	0	0
Settlements																																																					0	0	0	0
Distributions paid																																																					(131)	(201)	(676)	(2,969)
Redemption value adjustment																																																					0	(112)	(691)	(336)
Ending balance																																																					6,792	15,126	6,792	15,126
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date																																																					$ 0	$ 0	$ 0	$ 0