Inventory (Schedule of Inventory) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Inventory [Line Items]
Inventory	$ 217,132,000	$ 192,140,000
NonCash Additions to Inventory	6,700,000	19,000,000
Inventory in Exchange for Customer Receivable Reduction	4,700,000	19,000,000
Agency [Member]
Inventory [Line Items]
Inventory	157,835,000	130,665,000
Principal [Member]
Inventory [Line Items]
Inventory	$ 59,297,000	$ 61,475,000