Restructuring (Summary of Restructuring Charges) (Details) (USD $)	3 Months Ended			12 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restructuring Reserve [Roll Forward]
Expense	$ 160,000	$ 3,556,000	$ 14,747,000	$ 18,500,000	$ 18,463,000	$ 0
Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, January 1, 2013		4,600,000		4,600,000
Expense				(200,000)
Utilization				(4,100,000)
Restructuring Reserve, December 31, 2013				300,000
Other [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, January 1, 2013		1,700,000		1,700,000
Expense				100,000
Utilization				(1,800,000)
Restructuring Reserve, December 31, 2013				0
Severence and Other [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, January 1, 2013		6,300,000		6,300,000
Expense				(100,000)
Utilization				(5,900,000)
Restructuring Reserve, December 31, 2013				$ 300,000