Restructuring (Activity in Restructuring Accruals) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring Reserve [Roll Forward]
Balance at January 1, 2016			$ 40,396
Employee severance and related costs	$ 12,061	$ 13,766	62,142	$ 62,251
Payments			(67,607)
Reversal of previous charges			(318)
Balance at September 30, 2016	36,087		36,087
Employee Severance and Related Costs [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs			43,310
Other Restructuring Costs			1,158
Consolidation of Leased Facilities [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs			19,148
2014 Restructuring Program [Member]
Restructuring Reserve [Roll Forward]
Balance at January 1, 2016			1,121
Payments			(9)
Reversal of previous charges			(177)
Balance at September 30, 2016	935		935
2014 Restructuring Program [Member] | Employee Severance and Related Costs [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs			0
Other Restructuring Costs			0
2014 Restructuring Program [Member] | Consolidation of Leased Facilities [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs			0
2015 Restructuring Program [Member]
Restructuring Reserve [Roll Forward]
Balance at January 1, 2016			22,694
Employee severance and related costs	7,600		14,600
Payments			(7,952)
Reversal of previous charges			(141)
Balance at September 30, 2016	29,379		29,379
2015 Restructuring Program [Member] | Employee Severance and Related Costs [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs			72
Other Restructuring Costs			0
2015 Restructuring Program [Member] | Consolidation of Leased Facilities [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs			14,706
2015 Other Restructuring Program [Member]
Restructuring Reserve [Roll Forward]
Balance at January 1, 2016			16,581
Employee severance and related costs	4,400		47,700
Payments			(59,646)
Reversal of previous charges			0
Balance at September 30, 2016	$ 5,773		5,773
2015 Other Restructuring Program [Member] | Employee Severance and Related Costs [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs			43,238
Other Restructuring Costs			1,158
2015 Other Restructuring Program [Member] | Consolidation of Leased Facilities [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs			$ 4,442