Accrued Liabilities and Other Long Term Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accrued Liabilities, Current [Abstract]
Compensation And Payroll Taxes	$ 22,414	$ 12,837
Accrued Expense	23,159	12,338
Accrued Pricing Adjustments	2,891	1,304
Equipment Purchases	7,395	7,081
Accrued professional services	2,215	2,512
Other	2,610	5,067
Accrued Liabilities, Current, Total	60,684	41,139
Liabilities, Noncurrent [Abstract]
Accrued defined benefit plan	32,749	17,853
Unrecognized tax benefits	20,710	14,591	10,177
Income tax contingencies	9,829	0
Deferred compensation	3,535	2,213
Other	12,043	7,317
Liabilities, Noncurrent, Total	$ 78,866	$ 41,974