Income Taxes (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Income Taxes [Abstract]
Liability for uncertain tax positions that would affect the effective rate upon resolution	$ 500,000		$ 500,000		$ 500,000
Accrued interest and penalties related to tax positions	100,000		100,000		100,000
Provision (benefit) for income taxes	1,903,000	1,443,000	733,000	12,832,000
Federal income tax expense (benefit)	500,000		(800,000)
State income tax expense	300,000
Tax expense from Canadian subsidiary	$ 1,100,000		$ 1,500,000