|
Significant Accounting Policies (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
|
12 Months Ended |
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
| Consolidated Accounts Receivable Percentage |
10.00% |
10.00% |
|
| Consolidated Largest Client Revenue |
10.00% |
10.00% |
10.00% |
| Restricted Cash and Cash Equivalents, Noncurrent |
$ 44 |
$ 47 |
|
| Business Acquisition, Increase (Decrease) in Contingent Purchase Price Obligation |
35,914 |
53,027 |
12,849 |
| Business Combination, Acquisition Related Costs |
2,074 |
3,364 |
3,819 |
| Assets |
1,425,227 |
1,344,945 |
1,055,745 |
| Liabilities |
1,553,305 |
1,311,802 |
|
| Equity Method Investment, Ownership Percentage |
50.00% |
|
|
| Proceeds from Equity Method Investment, Dividends or Distributions |
3,096 |
|
|
| Equity Method Investment, Realized Gain (Loss) on Disposal |
3,058 |
|
|
| Cost Method Investments |
12,452 |
10,733 |
|
| Interest Rate Percentage On Senior Notes |
6.75% |
|
|
| Pension Expense |
6,450 |
4,090 |
2,356 |
| Allocated Share-based Compensation Expense, Total |
22,438 |
32,197 |
23,657 |
|
Doner [Member]
|
|
|
|
| Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage |
|
30.00% |
|
| Ownership Interest Percentage Increase On Exercise Of Option |
|
70.00% |
|
| Assets |
224,964 |
|
|
| Liabilities |
179,501 |
|
|
|
Real Estate Joint Venture [Member]
|
|
|
|
| Percentage Of Undivided Interest |
50.00% |
|
|
|
Minimum [Member]
|
|
|
|
| Property, Plant and Equipment, Useful Life |
3 years |
|
|
|
Maximum [Member]
|
|
|
|
| Property, Plant and Equipment, Useful Life |
7 years |
|
|
|
Performance Shares [Member]
|
|
|
|
| Stock Granted, Value, Share-based Compensation, Gross |
2,699 |
9,838 |
20,188 |
|
Equity Value Appreciation Awards [Member]
|
|
|
|
| Maximum Shares Issuance Restricted Stock Units And Shares |
1,917,000 |
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |
1.20% |
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |
2 years 11 months 5 days |
|
|
| Share Based Compensation Arrangements By Share Based Payment Award Grants In Period Weighted Average Grant Date Fair Value |
$ 9.37 |
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate |
31.70% |
|
|
|
Stock Appreciation Rights (SARs) [Member]
|
|
|
|
| Allocated Share-based Compensation Expense, Total |
$ 77,967 |
|
|