Restructuring (Summary of Restructuring Costs for San Diego Plan) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Restructuring Cost and Reserve [Line Items]
Costs incurred during the period	$ 110	$ 0	$ 3,466	$ 0
San Diego Office Transition Plan [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring costs expected to be incurred			454
Costs incurred during the period	83		279
Cumulative costs incurred as of September 30, 2013			454
San Diego Office Transition Plan [Member] | Other [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring costs expected to be incurred			454
Costs incurred during the period	83		279
Cumulative costs incurred as of September 30, 2013			454
San Diego Office Transition Plan [Member] | Employee Severance and Retention [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring costs expected to be incurred			295
Costs incurred during the period	0		120
Cumulative costs incurred as of September 30, 2013			295
San Diego Office Transition Plan [Member] | Employee Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring costs expected to be incurred			159
Costs incurred during the period	83		159
Cumulative costs incurred as of September 30, 2013			$ 159