Restructuring Charges - Summary of Restructuring Activities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Restructuring Reserve [Roll Forward]
Provision for restructuring charges	$ 2,769	$ 0	$ 2,769	$ 0
Employee severance [Member]
Restructuring Reserve [Roll Forward]
Balance, December 31, 2013			0
Provision for restructuring charges			1,509
Cash payments			(1,206)
Balance, September 30, 2014	303		303
Facility closing [Member]
Restructuring Reserve [Roll Forward]
Balance, December 31, 2013			0
Provision for restructuring charges			376
Cash payments			(78)
Balance, September 30, 2014	298		298
Excluding non-cash fixed asset write off [Member]
Restructuring Reserve [Roll Forward]
Balance, December 31, 2013			0
Provision for restructuring charges			1,885
Cash payments			(1,284)
Balance, September 30, 2014	$ 601		$ 601