Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Total unrecognized tax benefit	$ 35,618,000	$ 7,631,000	$ 12,510,000
Recognized interest expense	169,000	246,000	375,000
Interest accrued	1,733,000	1,730,000	4,500,000
Penalties accrued	0	0	$ 0
Net deferred tax liability	149,315,000	313,732,000
Deferred tax liability, by jurisdiction	177,748,000	341,290,000
Deferred tax asset, by jurisdiction	28,433,000	27,558,000
Decrease in valuation allowance related to deferred tax assets	4,946,000
Cumulative valuation allowance against deferred tax assets	13,218,000	18,164,000
Deferred tax asset	1,044,390,000	$ 988,855,000
Cumulative amount of undistributed earnings	198,325,000
Additional U.S. taxes incurred, net of anticipated foreign tax credits	21,285,000
Net operating loss carryforwards	$ 163,722,000