Consolidated Statements of Operations (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Consolidated Statements of Operations [Abstract]
Revenues	$ 221,469	$ 166,485	$ 164,395
Cost of revenues	182,120	136,200	134,393
Gross profit	39,349	30,285	30,002
Operating expenses:
Research and development	13,481	11,662	12,930
Selling, general and administrative	14,418	12,485	14,166
Amortization related to a lease agreement early termination		7,464
Total operating expenses	27,899	31,611	27,096
Operating profit (loss)	11,450	(1,326)	2,906
Interest expenses, net	(8,334)	(7,330)	(7,666)
Other financing expense, net	(20,706)	(7,033)	(5,772)
Other income (expense), net		(433)	159
Loss before income tax benefit	(17,590)	(16,122)	(10,373)
Income tax benefit	6,325	5,346	3,052
Net loss	$ (11,265)	$ (10,776)	$ (7,321)