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Commitments and Contingencies (Details Textual) $ in Thousands, AUD in Millions				12 Months Ended
	Feb. 12, 2018 USD ($)	Feb. 08, 2017 USD ($)	Feb. 01, 2016 USD ($)	Dec. 31, 2017 USD ($) renewal	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 AUD
Commitments and Contingencies [Line Items]
Operating agreements, number of renewal options | renewal				2
Operating agreements, renewal option, term				5 years
Minimum rent expense				$ 45,400	$ 38,200	$ 36,900
Estimated construction capital project cost				251,300
Cost already spent on existing capital projects				101,900
Remaining capital required for capital projects				149,400
Damages sought, value		$ 256,000
Exit charges related to non-core operating leases				0	$ 0	$ 4,550
Estimate of possible loss				$ 19,600
Workforce Subject to Collective Bargaining Arrangements
Commitments and Contingencies [Line Items]
Concentration risk, percentage				36.00%
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year
Commitments and Contingencies [Line Items]
Concentration risk, percentage				13.00%
National Australia Bank Limited | Ravenhall | Non Recourse Debt
Commitments and Contingencies [Line Items]
Capital contribution				$ 89,800			AUD 115
Construction Facility | National Australia Bank Limited | Ravenhall | Non Recourse Debt
Commitments and Contingencies [Line Items]
Maximum borrowing capacity				$ 617,500			AUD 791
Senior Officer Employment Agreement | Senior Vice President
Commitments and Contingencies [Line Items]
Initial term of contract			2 years
Additional term of contract			2 years
Continuous rolling extension period until maximum age (67 years) reached			1 day
Maximum age for contract termination			67 years
Officers' compensation			$ 500
Subsequent Event | Senior Officer Employment Agreement | Senior Vice President
Commitments and Contingencies [Line Items]
Initial term of contract	2 years
Additional term of contract	2 years
Continuous rolling extension period until maximum age (67 years) reached	1 day
Maximum age for contract termination	67 years
Officers' compensation	$ 400

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Remaining capital required for capital projects.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Developers, builders, governmental agencies and municipalities will provide the entity with cash, or in some cases property, to extend its services to their properties. Nonrefundable contributions are recorded as contributions in aid of construction ("CIAC").

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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