Income Taxes (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of unrecognized tax benefits, excluding penalties and interest
Balance at the beginning of the period	$ 8,322,000	$ 7,467,000	$ 4,759,000
Increases during the year:
Gross increases - tax positions in prior period	644,000	275,000	1,684,000
Gross increases - current-period tax positions	1,355,000	2,215,000	1,844,000
Decreases during the year:
Gross decreases - tax positions in prior period	(71,000)	(429,000)	(183,000)
Decreases due to settlements with taxing authorities	(154,000)
Decreases due to lapse of statute of limitations	(1,083,000)	(1,206,000)	(637,000)
Balance at the end of the period	9,013,000	8,322,000	7,467,000
Number of open tax years settled	4 years	3 years	0 years
Estimated decrease in unrecognized tax benefits within the next 12-month period, high end of range	2,600,000
Estimated decrease in unrecognized tax benefits net of federal benefits within the next 12-month period	$ 1,700,000