Income Taxes (Schedule of Effective Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
U.S. statutory federal rate applied to pretax income (loss)	35.00%	35.00%	35.00%
State and local income taxes, net of federal benefit	2.00%	2.60%	(1.00%)
Foreign tax rate differential	0.30%	(0.10%)	(14.40%)
Non-deductible expenses	2.20%	4.40%	(13.50%)
Goodwill and intangible assets	(0.00%)	(0.70%)	(17.70%)
Change in tax rate	(32.30%)	(1.90%)	(3.60%)
Domestic production activities deduction	(0.20%)	(2.90%)	(1.00%)
Other	(0.70%)	(0.10%)	(1.40%)
Tax credits	(2.80%)	(0.00%)	(0.00%)
Valuation allowance for deferred tax assets	2.70%	4.30%	0.00%
Effective income tax rate	6.20%	40.60%	(17.60%)