Leases (Schedule of Future Minimum Rental Payments for Operating Leases) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Leases [Abstract]
Operating Leases, Future Minimum Payments, Due Current	$ 16,065
Operating Leases, Future Minimum Payments, Due In Two Years	16,165
Operating Leases, Future Minimum Payments, Due In Three Years	16,331
Operating Leases, Future Minimum Payments, Due In Four Years	16,283
Operating Leases, Future Minimum Payments, Due In Five Years	10,171
Operating Leases, Future Minimum Payments, Due Thereafter	$ 12,139

For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within one year of the balance sheet date relating to leases defined as operating.

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the fifth year of the balance sheet date relating to leases defined as operating.

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- Definition

For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the fourth year of the balance sheet date relating to leases defined as operating.

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- Definition

For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the third year of the balance sheet date relating to leases defined as operating.

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- Definition

For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the second year of the balance sheet date relating to leases defined as operating.

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- Definition

For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due after the fifth year from the balance sheet date on leases defined as operating.

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