Business Segment and Geographic Region Information (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue and long-lived assets by geographic region
Revenue	$ 58,574	$ 48,831	$ 47,501	$ 40,726	$ 44,624	$ 44,640	$ 59,114	$ 55,007	$ 195,632	$ 203,385	$ 319,416
Long-Lived Assets	44,904				44,192				44,904	44,192	55,468
United States
Revenue and long-lived assets by geographic region
Revenue									116,969	132,159	234,123
Long-Lived Assets	44,424				43,440				44,424	43,440	54,472
Europe
Revenue and long-lived assets by geographic region
Revenue									27,933	27,636	31,505
Asia Pacific
Revenue and long-lived assets by geographic region
Revenue									50,730	43,590	53,779
Long-Lived Assets	480				752				480	752	996
International | Revenue | Geographic concentration risk
Revenue and long-lived assets by geographic region
Revenue									$ 149,400	$ 142,800	$ 231,000
Percentage of revenue									76.40%	70.20%	72.30%