Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Income Tax Contingency [Line Items]
REIT liquidation tax charge	$ 93,000,000
REIT Liquidiation deferred tax benefit	5,800,000
Deferred tax assets, other	$ 31,432,000	[1]	$ 22,142,000	[2]
Income tax expense, restructuring domestic TRS			$ 2,600,000		$ 21,500,000
Dividend paid deduction, percentage	36.00%		24.00%		28.00%
Valuation allowance	$ 136,952,000		$ 141,241,000		$ 136,006,000	$ 95,558,000
Undistributed earnings of foreign subsidiaries	490,600,000
Excess tax benefit from the exercise of employee stock options	51,600,000
Decrease in unrecognized tax benefits, lapse of applicable statute of limitations	3,504,000		5,349,000		1,218,000
Unrecognized tax benefits, income tax penalties and interest	100,000		(3,400,000)		$ 3,400,000
Unrecognized tax benefits, income tax penalties and interest accrued	20,200,000		24,900,000
Minimum
Income Tax Contingency [Line Items]
Decrease in unrecognized tax benefits is reasonably possible	0
Maximum
Income Tax Contingency [Line Items]
Decrease in unrecognized tax benefits is reasonably possible	14,300,000
Other Noncurrent Liabilities
Income Tax Contingency [Line Items]
Unrecognized tax benefits that would impact the ETR	28,100,000		31,900,000
Mexican Tax Authority
Income Tax Contingency [Line Items]
Tax credit carryforward	$ 1,800,000
MIPT
Income Tax Contingency [Line Items]
Deferred tax assets, other			$ 13,100,000

[1] Change in accounting pronouncement, as described below.

[2] December 31, 2014 balances have been revised to reflect purchase accounting measurement period adjustments.