Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Federal statutory income tax rate		35.00%	35.00%	35.00%
Write-off of deferred taxes related to intercompany loans		$ 10,965,000	$ 0	$ 0
Deferred income tax expense (benefit)		10,070,000	11,929,000	62,628,000
Tax expenses with respect to losses from discontinued operations			27,800,000	82,400,000
Deferred state income tax asset		23,178,000	19,550,000
Deferred tax assets with respect to U.S. Federal income tax loss carryforwards		6,212,000	5,007,000
Deferred tax assets with respect to non U.S. income tax loss carryforwards		19,246,000	26,921,000
Non-U.S.deferred tax asset related to capital loss carryforwards		1,929,000	10,055,000
Valuation Allowance, Amount		41,319,000	69,545,000
Interest accrued related to unrecognized tax benefits		700,000
Penalties accrued related to unrecognized tax benefits		0
Adjustment [Member]
Income Taxes [Line Items]
Deferred income tax expense (benefit)		(5,600,000)
State [Member]
Income Taxes [Line Items]
Income tax loss carryforwards to expire		455,600,000
Deferred state income tax asset		23,200,000
Valuation Allowance, Amount		31,800,000
Valuation allowance related to operating loss carryforwards		21,000,000
Valuation allowance released		3,196,000	(3,285,000)	(4,960,000)
Unrecognized tax benefit that would impact the effective tax rate		5,100,000
U.S. Federal [Member]
Income Taxes [Line Items]
Income tax loss carryforwards obtained as a result of prior stock acqusitions		17,600,000
Deferred tax assets with respect to U.S. Federal income tax loss carryforwards		6,200,000
Foreign tax credit carryforwards		1,900,000
Deferred tax assets with respect to U.S. Federal foreign tax credit carryforwards		1,900,000
Federal tax impact of unrecognized tax benefits that would impact the effective tax rate		1,800,000
U.S. Federal [Member] | Expire in 2024 [Member]
Income Taxes [Line Items]
Foreign tax credit carryforwards		700,000
U.S. Federal [Member] | Expire in 2025 [Member]
Income Taxes [Line Items]
Foreign tax credit carryforwards		700,000
U.S. Federal [Member] | Expire in 2026 [Member]
Income Taxes [Line Items]
Foreign tax credit carryforwards		500,000
non-U.S. [Member]
Income Taxes [Line Items]
Deferred tax assets with respect to U.S. Federal foreign tax credit carryforwards		1,921,000	1,374,000
Tax loss carryforwards as a result of operating losses and prior stock acquisitions		69,300,000
Deferred tax assets with respect to non U.S. income tax loss carryforwards		19,200,000
Valuation allowance against the deferred tax assets recorded for the tax losses carryforward		4,900,000
Tax loss carryforwards from operating losses and prior stock acquisitions that can be carried forward indefinitely		60,300,000
Non-U.S.deferred tax asset related to capital loss carryforwards		1,900,000
Valuation Allowance, Amount		9,500,000
Valuation allowance released		(12,688,000)	431,000	$ (2,477,000)
non-U.S. [Member] | Through 2021 [Member]
Income Taxes [Line Items]
Tax loss carryforwards subject to expiration		4,800,000
non-U.S. [Member] | After 2021 [Member]
Income Taxes [Line Items]
Tax loss carryforwards subject to expiration		4,200,000
U.S. Federal and State [Member]
Income Taxes [Line Items]
Deferred income tax liabilities related to undistributed earnings of investments in non-U.S. subsidiaries		23,800,000	17,500,000
Excess of book value over tax basis of investment		103,300,000	71,800,000
Additional deferred tax liabilitites due to excess of book value over tax basis of investment		300,000	$ 0
Australian Taxation Office [Member]
Income Taxes [Line Items]
Valuation allowance released	$ 19,300,000
Capital loss carryforwards to 2013 tax year [Member] | U.S. Federal [Member]
Income Taxes [Line Items]
Income Taxes Receivable		10,500,000
Capital loss carryforward [Member] | non-U.S. [Member]
Income Taxes [Line Items]
Carryforward amount		6,400,000
Valuation Allowance, Amount		$ 1,900,000