Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Cash Flow Information [ Abstract]
Leasehold improvements funded by lessor	$ 0	$ 0	$ 22
Interest and taxes paid [Abstract]
Interest paid	4,320	4,200	2,125
Income taxes paid	$ 27,450	$ 21,455	$ 2,778