Fair Value Measurements (Financial assets and liabilities measured at fair value on a recurring basis) (Details) (Fair Value, Measurements, Recurring [Member], USD $) | Mar. 31, 2014 | Dec. 31, 2013 |
In Thousands, unless otherwise specified |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value Disclosure | $8,919 | $8,817 |
Non-Qualified Deferred Compensation Assets [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Intangible and other long-term assets | 11,779 | 13,731 |
Interest Rate Swap [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Intangible and other long-term assets | 973 | 337 |
Non Qualified Deferred Compensation Liabilities [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Accounts payable | 1,788 | 1,944 |
Other long-term liabilities | 14,172 | 14,986 |
Level 1 [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value Disclosure | 8,919 | 8,817 |
Level 1 [Member] | Non-Qualified Deferred Compensation Assets [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Intangible and other long-term assets | 342 | 2,330 |
Level 1 [Member] | Interest Rate Swap [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Intangible and other long-term assets | ' | ' |
Level 1 [Member] | Non Qualified Deferred Compensation Liabilities [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Accounts payable | ' | ' |
Other long-term liabilities | ' | ' |
Level 2 [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value Disclosure | ' | ' |
Level 2 [Member] | Non-Qualified Deferred Compensation Assets [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Intangible and other long-term assets | 11,437 | 11,401 |
Level 2 [Member] | Interest Rate Swap [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Intangible and other long-term assets | 973 | 337 |
Level 2 [Member] | Non Qualified Deferred Compensation Liabilities [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Accounts payable | 1,788 | 1,944 |
Other long-term liabilities | 14,172 | 14,986 |
Level 3 [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value Disclosure | ' | ' |
Level 3 [Member] | Non-Qualified Deferred Compensation Assets [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Intangible and other long-term assets | ' | ' |
Level 3 [Member] | Interest Rate Swap [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Intangible and other long-term assets | ' | ' |
Level 3 [Member] | Non Qualified Deferred Compensation Liabilities [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Accounts payable | ' | ' |
Other long-term liabilities | ' | ' |