CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Stock options	Dec. 31, 2012 Stock options	Dec. 31, 2011 Stock options	Dec. 31, 2013 Restricted Stock Unit	Dec. 31, 2012 Restricted Stock Unit	Dec. 31, 2011 Restricted Stock Unit
Supplemental Disclosure of Noncash Financing Activities:
Equity based employee compensation granted	24	24	935	829	829	829
Common stock withheld in exercise costs in shares	17	10	324	3	2	1
Common stock withheld in exercise costs	$ 32,000	$ 31,000	$ 1,300,000	$ 7,000	$ 7,000	$ 3,000
Withholding of exercise cost in shares	1	5	228	321	296	288
Minimum statutory withholding payroll taxes withheld	$ 4,000	$ 15,000	$ 886,000	$ 712,000	$ 1,000,000	$ 948,000
Common Stock issued upon exercise	6	9	383	505	531	540