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Consolidating Financial Information (Condensed Consolidating Statements Of Cash Flows) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash provided from (used in) operating activities $ 184,598,000 $ 164,047,000 $ 225,675,000
Capital expenditures (53,515,000) (36,406,000) (89,133,000)
Deposits for interest rate swap (46,467,000) (44,072,000) (38,730,000)
Return of deposits for interest rate swap 33,600,000 36,180,000 23,460,000
Payments on settlement of interest rate swap (5,148,000) (2,574,000) 0
Receipts from settlement of interest rate swap 274,000 266,000 0
Acquisition of business (net of cash acquired of $1.8 million in 2010) 0 (41,300,000) 0
Deposits for interest rate lock agreement 0 0 (5,000,000)
Return of deposits for interest rate lock agreement 0 0 15,500,000
Purchase of short-term investment 0 0 (300,000)
Foundry Park I deferred leasing costs 0 0 (1,500,000)
Cash dividends from subsidiaries 0 0 0
Cash provided from (used in) investing activities (70,956,000) (87,906,000) (95,703,000)
Net borrowings (repayments) under revolving credit agreement 18,000,000 4,000,000 (41,900,000)
Repayment on Foundry Park I mortgage loan (2,731,000) (2,125,000) 0
Net borrowings under lines of credit 6,529,000 1,494,000 0
Repurchases of common stock (98,093,000) (121,517,000) 0
Draws on Foundry Park I construction loan 0 0 55,603,000
Dividends paid (32,588,000) (22,608,000) (16,347,000)
Debt issuance costs (3,233,000) (3,992,000) (465,000)
Excess tax benefits from stock-based payment arrangements 1,102,000 711,000 0
Proceeds from exercise of stock options 70,000 91,000 40,000
Payments on the capital lease (144,000) (835,000) (784,000)
Payment for financed intangible asset 0 (1,000,000) (1,000,000)
Issuance of intercompany note payable   0 0
Repayment of intercompany note payable   0 0
Financing from affiliated companies 0 0 0
Cash acquired in acquisition of business   1,800,000  
Proceeds from sale of short-term investment 300,000 0 0
Repayment of Foundry Park I construction loan 0 (99,102,000) 0
Borrowing under Foundry Park I mortgage loan 0 68,400,000 0
Cash provided from (used in) financing activities (111,088,000) (176,483,000) (4,853,000)
Effect of foreign exchange on cash and cash equivalents (1,376,000) (2,297,000) 4,951,000
Increase (decrease) in cash and cash equivalents 1,178,000 (102,639,000) 130,070,000
Cash and cash equivalents at beginning of year 49,192,000 151,831,000 21,761,000
Cash and cash equivalents at end of year 50,370,000 49,192,000 151,831,000
Parent Company [Member]
      
Cash provided from (used in) operating activities (16,646,000) 52,328,000 (86,987,000)
Capital expenditures 0 0 0
Deposits for interest rate swap (46,467,000) (44,072,000) (38,730,000)
Return of deposits for interest rate swap 33,600,000 36,180,000 23,460,000
Payments on settlement of interest rate swap (5,148,000) (2,574,000)  
Receipts from settlement of interest rate swap 274,000 266,000  
Acquisition of business (net of cash acquired of $1.8 million in 2010)   0  
Deposits for interest rate lock agreement     0
Return of deposits for interest rate lock agreement     0
Purchase of short-term investment     (300,000)
Foundry Park I deferred leasing costs     0
Cash dividends from subsidiaries 2,520,000 2,800,000 221,950,000
Cash provided from (used in) investing activities (14,921,000) (7,400,000) 206,380,000
Net borrowings (repayments) under revolving credit agreement 18,000,000 4,000,000 (41,900,000)
Repayment on Foundry Park I mortgage loan 0 0  
Net borrowings under lines of credit 0 0  
Repurchases of common stock (98,093,000) (121,517,000)  
Draws on Foundry Park I construction loan     0
Dividends paid (32,588,000) (22,608,000) (16,347,000)
Debt issuance costs (3,233,000) (2,468,000) (465,000)
Excess tax benefits from stock-based payment arrangements 1,102,000 0  
Proceeds from exercise of stock options 70,000 91,000 40,000
Payments on the capital lease 0 0 0
Payment for financed intangible asset   0 0
Issuance of intercompany note payable   0 0
Repayment of intercompany note payable   0 0
Financing from affiliated companies 146,309,000 57,583,000 (20,713,000)
Proceeds from sale of short-term investment 300,000    
Repayment of Foundry Park I construction loan   0  
Borrowing under Foundry Park I mortgage loan   0  
Cash provided from (used in) financing activities 31,567,000 (84,919,000) (79,385,000)
Effect of foreign exchange on cash and cash equivalents 0 0 0
Increase (decrease) in cash and cash equivalents 0 (39,991,000) 40,008,000
Cash and cash equivalents at beginning of year 17,000 40,008,000 0
Cash and cash equivalents at end of year 17,000 17,000 40,008,000
Guarantor Subsidiaries [Member]
      
Cash provided from (used in) operating activities 148,723,000 96,995,000 256,789,000
Capital expenditures (25,190,000) (20,804,000) (70,211,000)
Deposits for interest rate swap 0 0 0
Return of deposits for interest rate swap 0 0 0
Payments on settlement of interest rate swap 0 0  
Receipts from settlement of interest rate swap 0 0  
Acquisition of business (net of cash acquired of $1.8 million in 2010)   0  
Deposits for interest rate lock agreement     (5,000,000)
Return of deposits for interest rate lock agreement     15,500,000
Purchase of short-term investment     0
Foundry Park I deferred leasing costs     (1,500,000)
Cash dividends from subsidiaries 30,228,000 12,111,000 10,796,000
Cash provided from (used in) investing activities 5,038,000 (8,693,000) (50,415,000)
Net borrowings (repayments) under revolving credit agreement 0 0 0
Repayment on Foundry Park I mortgage loan (2,731,000) (2,125,000)  
Net borrowings under lines of credit 0 0  
Repurchases of common stock 0 0  
Draws on Foundry Park I construction loan     55,603,000
Dividends paid (2,520,000) (2,800,000) (221,950,000)
Debt issuance costs 0 (1,524,000) 0
Excess tax benefits from stock-based payment arrangements 0 711,000  
Proceeds from exercise of stock options 0 0 0
Payments on the capital lease (144,000) (835,000) (784,000)
Payment for financed intangible asset   (1,000,000) (1,000,000)
Issuance of intercompany note payable   (43,807,000) (13,402,000)
Repayment of intercompany note payable   (950,000) 13,236,000
Financing from affiliated companies (146,309,000) (57,583,000) 20,713,000
Proceeds from sale of short-term investment 0    
Repayment of Foundry Park I construction loan   (99,102,000)  
Borrowing under Foundry Park I mortgage loan   68,400,000  
Cash provided from (used in) financing activities (151,704,000) (140,615,000) (147,584,000)
Effect of foreign exchange on cash and cash equivalents (121,000) (2,173,000) (995,000)
Increase (decrease) in cash and cash equivalents 1,936,000 (54,486,000) 57,795,000
Cash and cash equivalents at beginning of year 7,717,000 62,203,000 4,408,000
Cash and cash equivalents at end of year 9,653,000 7,717,000 62,203,000
Non-Guarantor Subsidiaries [Member]
      
Cash provided from (used in) operating activities 52,521,000 14,724,000 55,873,000
Capital expenditures (28,325,000) (15,602,000) (18,922,000)
Deposits for interest rate swap 0 0 0
Return of deposits for interest rate swap 0 0 0
Payments on settlement of interest rate swap 0 0  
Receipts from settlement of interest rate swap 0 0  
Acquisition of business (net of cash acquired of $1.8 million in 2010)   (41,300,000)  
Deposits for interest rate lock agreement     0
Return of deposits for interest rate lock agreement     0
Purchase of short-term investment     0
Foundry Park I deferred leasing costs     0
Cash dividends from subsidiaries 0 0 0
Cash provided from (used in) investing activities (28,325,000) (56,902,000) (18,922,000)
Net borrowings (repayments) under revolving credit agreement 0 0 0
Repayment on Foundry Park I mortgage loan 0 0  
Net borrowings under lines of credit 6,529,000 1,494,000  
Repurchases of common stock 0 0  
Draws on Foundry Park I construction loan     0
Dividends paid (30,228,000) (12,111,000) (10,796,000)
Debt issuance costs 0 0 0
Excess tax benefits from stock-based payment arrangements 0 0  
Proceeds from exercise of stock options 0 0 0
Payments on the capital lease 0 0 0
Payment for financed intangible asset   0 0
Issuance of intercompany note payable   43,807,000 13,402,000
Repayment of intercompany note payable   950,000 (13,236,000)
Financing from affiliated companies 0 0 0
Proceeds from sale of short-term investment 0    
Repayment of Foundry Park I construction loan   0  
Borrowing under Foundry Park I mortgage loan   0  
Cash provided from (used in) financing activities (23,699,000) 34,140,000 (10,630,000)
Effect of foreign exchange on cash and cash equivalents (1,255,000) (124,000) 5,946,000
Increase (decrease) in cash and cash equivalents (758,000) (8,162,000) 32,267,000
Cash and cash equivalents at beginning of year 41,458,000 49,620,000 17,353,000
Cash and cash equivalents at end of year 40,700,000 41,458,000 49,620,000
Total Consolidating Adjustments [Member]
      
Cash provided from (used in) operating activities 0 0 0
Capital expenditures 0 0 0
Deposits for interest rate swap 0 0 0
Return of deposits for interest rate swap 0 0 0
Payments on settlement of interest rate swap 0 0  
Receipts from settlement of interest rate swap 0 0  
Acquisition of business (net of cash acquired of $1.8 million in 2010)   0  
Deposits for interest rate lock agreement     0
Return of deposits for interest rate lock agreement     0
Purchase of short-term investment     0
Foundry Park I deferred leasing costs     0
Cash dividends from subsidiaries (32,748,000) (14,911,000) (232,746,000)
Cash provided from (used in) investing activities (32,748,000) (14,911,000) (232,746,000)
Net borrowings (repayments) under revolving credit agreement 0 0 0
Repayment on Foundry Park I mortgage loan 0 0  
Net borrowings under lines of credit 0 0  
Repurchases of common stock 0 0  
Draws on Foundry Park I construction loan     0
Dividends paid 32,748,000 14,911,000 232,746,000
Debt issuance costs 0 0 0
Excess tax benefits from stock-based payment arrangements 0 0  
Proceeds from exercise of stock options 0 0 0
Payments on the capital lease 0 0 0
Payment for financed intangible asset   0 0
Issuance of intercompany note payable   0 0
Repayment of intercompany note payable   0 0
Financing from affiliated companies 0 0 0
Proceeds from sale of short-term investment 0    
Repayment of Foundry Park I construction loan   0  
Borrowing under Foundry Park I mortgage loan   0  
Cash provided from (used in) financing activities 32,748,000 14,911,000 232,746,000
Effect of foreign exchange on cash and cash equivalents 0 0 0
Increase (decrease) in cash and cash equivalents 0 0 0
Cash and cash equivalents at beginning of year 0 0 0
Cash and cash equivalents at end of year $ 0 $ 0 $ 0