Income Taxes (Income Tax Reconciliation) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Corporate statutory rate 35.00% 35.00% 35.00%
Income tax expense on income before income taxes $ 177,768 $ 140,751 $ 66,618
Tax effect of:      
State and local income taxes, net of federal benefit 13,527 10,726 4,281
Transaction costs and transaction related expenses 453 938 5,252
Dividend withholding tax 0 (65) 13,074
Impact of foreign tax rates (3,191) (3,693) (1,582)
Non-controlling interest (22,452) (13,670) (1,645)
Cross-jurisdictional financing (48,252) (44,659) (23,937)
Other 3,662 4,479 3,763
Valuation allowance 12,671 8,596 3,492
Income tax expense $ 134,186 $ 103,403 $ 69,316