Income Taxes (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of unrecognized tax benefits
Balance at the beginning of the period	$ 3,843,000	$ 4,683,000	$ 5,862,000
Additions based on tax positions related to prior years	297,000	527,000	18,000
Reductions based on tax positions related to prior years	(494,000)	(1,163,000)	(681,000)
Additions for tax positions of the current year	837,000	933,000	570,000
Settlements	(435,000)	(486,000)	(362,000)
Lapse of statute of limitations	(592,000)	(651,000)	(724,000)
Balance at the end of the period	3,456,000	3,843,000	4,683,000
Portion of uncertain tax benefit, if recognized, would reduce effective tax rate	700,000	900,000	1,100,000
Amount of decrease in unrecognized tax benefits that is reasonably possible within the next 12 months	1,800,000
Decrease in accrued interest as a result of the reversal of accrued interest associated with the lapse of statutes of limitations	300,000	400,000	0
Accrued interest	$ 400,000	$ 700,000	$ 1,100,000