Fair Value Measurement (Changes in Level 3 Table) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Fair Value Disclosures [Abstract]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	$ 0		$ 159,916		$ 0		$ 159,916
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases	0		0		0		0
fair value measurement asssets acquired	0	[1]	3,271	[1]	0	[1]	3,271	[1]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Available-for-sale securities, Beginning balance	349,425		51,234		347,610		49,661
True-up liability, Beginning balance	11,983		12,783		11,463		12,259
Available-for-sale securities, Total unrealized gains/losses	0	[1]	0	[1]	0	[1]	0	[1]
True-up liability, Total unrealized gains/losses	598	[1]	(1,846)	[1]	1,118	[1]	(1,322)	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	1,253	[2]	(1,923)	[2]	3,021	[2]	(363)	[2]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	[2]	0	[2]	0	[2]	0	[2]
Available-for-sale securities, Settlements	55		14		102		27
True-up liability, Settlements	0		0		0		0
Available-for-sale securities, Ending balance	350,733		212,512		350,733		212,512
True-up liability, Ending balance	$ 12,581		$ 10,937		$ 12,581		$ 10,937

[1] (a) Reported in "Other expense

[2] (b) Reported in "Other comprehensive income (loss)