Income Taxes Company's uncertain tax positions (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Company's uncertain tax positions [Abstract]
Balance as of the beginning of the year	$ 4,355,000	$ 4,537,000
Tax positions related to current year:
Additions	80,000	241,000
Reductions	0	0
Tax positions related to prior years:
Additions	0	167,000
Reductions	(405,000)	0
Settlements	0	0
Lapses in statute of limitations	(648,000)	(590,000)
Balance as of the end of the year	3,382,000	4,355,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	670,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	140,000
Unrecognized tax benfits, reduction in accrued interest and penalties	$ 71,000