Restructuring (Activity in Restructuring Accruals) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Restructuring Reserve [Roll Forward]
Balance at January 1, 2016	$ 40,396
Employee severance and related costs	46,065	$ 33,951
Payments	(40,025)
Reversal of previous charges	79
Balance at March 31, 2016	46,436
Employee Severance and Related Costs [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs	36,452
Consolidation of Leased Facilities [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs	9,692
2014 Restructuring Program [Member]
Restructuring Reserve [Roll Forward]
Balance at January 1, 2016	1,121
Payments	0
Reversal of previous charges	0
Balance at March 31, 2016	1,121
2014 Restructuring Program [Member] | Employee Severance and Related Costs [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related 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	6,974
Payments	(3,324)
Reversal of previous charges	(79)
Balance at March 31, 2016	26,344
2015 Restructuring Program [Member] | Employee Severance and Related Costs [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs	73
2015 Restructuring Program [Member] | Consolidation of Leased Facilities [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs	6,980
2015 Other Restructuring Program [Member]
Restructuring Reserve [Roll Forward]
Balance at January 1, 2016	16,581
Employee severance and related costs	39,091
Payments	(36,701)
Reversal of previous charges	0
Balance at March 31, 2016	18,971
2015 Other Restructuring Program [Member] | Employee Severance and Related Costs [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs	36,379
2015 Other Restructuring Program [Member] | Consolidation of Leased Facilities [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs	$ 2,712