Material Commitments (Tables)

12 Months Ended

Dec. 31, 2013

Material Commitments [Abstract]

Schedule of Future Minimum Annual Operating Lease Payments

Minimum annual operating lease payments as of December 31, 2013 are approximately as follows:

Year ending December 31,	in thousands
2014	$	7,058
2015		8,402
2016		7,534
2017		5,427
2018		5,456
Thereafter		30,970
	$	64,847