Goodwill and Other Intangible Assets (Details 1) (USD $) | 3 Months Ended | |
In Thousands, unless otherwise specified | Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 |
Other Intangible Assets | ' | ' | ' |
Gross Carrying Amount | $146,138 | $145,156 | ' |
Accumulated Amortization | -61,010 | -58,485 | ' |
Other intangible assets, net | 85,128 | 86,671 | 86,671 |
Aggregate amortization expense | 5,147 | 5,044 | ' |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] | ' | ' | ' |
Remainder of 2014 | 15,651 | ' | ' |
2015 | 19,094 | ' | ' |
2016 | 16,162 | ' | ' |
2017 | 9,924 | ' | ' |
2018 | 6,350 | ' | ' |
Thereafter | 17,947 | ' | ' |
Other intangible assets, net | 85,128 | 86,671 | 86,671 |
Noncontractual customer relationships [Member] | ' | ' | ' |
Other Intangible Assets | ' | ' | ' |
Gross Carrying Amount | 109,330 | 109,842 | ' |
Accumulated Amortization | -44,281 | -41,895 | ' |
Other intangible assets, net | 65,049 | 67,947 | ' |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] | ' | ' | ' |
Other intangible assets, net | 65,049 | 67,947 | ' |
Covenants not-to-compete [Member] | ' | ' | ' |
Other Intangible Assets | ' | ' | ' |
Gross Carrying Amount | 8,718 | 8,843 | ' |
Accumulated Amortization | -4,361 | -4,661 | ' |
Other intangible assets, net | 4,357 | 4,182 | ' |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] | ' | ' | ' |
Other intangible assets, net | 4,357 | 4,182 | ' |
Favorable lease asset [Member] | ' | ' | ' |
Other Intangible Assets | ' | ' | ' |
Gross Carrying Amount | 9,537 | 7,458 | ' |
Accumulated Amortization | -4,535 | -4,373 | ' |
Other intangible assets, net | 5,002 | 3,085 | ' |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] | ' | ' | ' |
Other intangible assets, net | 5,002 | 3,085 | ' |
Trademarks [Member] | ' | ' | ' |
Other Intangible Assets | ' | ' | ' |
Gross Carrying Amount | 12,655 | 13,115 | ' |
Accumulated Amortization | -4,308 | -4,194 | ' |
Other intangible assets, net | 8,347 | 8,921 | ' |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] | ' | ' | ' |
Other intangible assets, net | 8,347 | 8,921 | ' |
Contracts [Member] | ' | ' | ' |
Other Intangible Assets | ' | ' | ' |
Gross Carrying Amount | 608 | 608 | ' |
Accumulated Amortization | -326 | -305 | ' |
Other intangible assets, net | 282 | 303 | ' |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] | ' | ' | ' |
Other intangible assets, net | 282 | 303 | ' |
Technology [Member] | ' | ' | ' |
Other Intangible Assets | ' | ' | ' |
Gross Carrying Amount | 5,240 | 5,240 | ' |
Accumulated Amortization | -3,153 | -3,015 | ' |
Other intangible assets, net | 2,087 | 2,225 | ' |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] | ' | ' | ' |
Other intangible assets, net | 2,087 | 2,225 | ' |
Client lists [Member] | ' | ' | ' |
Other Intangible Assets | ' | ' | ' |
Gross Carrying Amount | 50 | 50 | ' |
Accumulated Amortization | -46 | -42 | ' |
Other intangible assets, net | 4 | 8 | ' |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] | ' | ' | ' |
Other intangible assets, net | $4 | $8 | ' |