Fair Value Measurement (Changes in Level 3 Table) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Fair Value Disclosures [Abstract]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	$ 0		$ 111,941		$ 0		$ 271,857
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases	0		0		0		0
fair value measurement asssets acquired	0	[1]	0	[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	350,733		212,512		347,610		49,661
True-up liability, Beginning balance	12,581		10,937		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	223		520	[1]	1,341		(802)	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	277	[2]	(1,704)	[2]	3,298	[2]	(2,066)	[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	(3,489)		13		(3,387)		39
True-up liability, Settlements	0		0		0		0
Available-for-sale securities, Ending balance	347,521		322,762		347,521		322,762
True-up liability, Ending balance	$ 12,804		$ 11,457		$ 12,804		$ 11,457

[1] (a) Reported in "Other expense

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